{"metadata":{"rule":"claude_score <= 3 AND gemini_score <= 3; finite nonnegative scores required","evaluation_version":"original","total_source":489,"selected":191,"with_images":118,"sources":[{"path":"pediamed-mdle-challenge/release/data/challenge_2026_03_07.jsonl","sha256":"0ff222fb8378aa29f39e65daad6dd6efd28f7631c434162c24da3ea06965dc61"},{"path":"pediamed-question-simplifier/work/release/challenge_2026_03_07_simplified.jsonl","sha256":"710d5024064b72f16738e28eb0d3d3e815833051060cc3c6e9fc419875f19439"},{"path":"presentation/source/cases/06_dermatology_rewrite_alignment/record_v1.2.1.json","sha256":"34c8ad2e07862c4a3aa600d781e32beffc071f21e4c200c02c0ef05bbe7f537c"}]},"items":[{"id":"q01-04cfddb40624b468","specialty":"Pediatric Head and Neck Surgical Oncology / Neuroradiology","type":"Investigation Interpretation","month":"2026-03","claude_score":0.0,"gemini_score":0.0,"title":"Neuroblastoma in neonates: a case report and literature review","image_count":2,"has_response":true,"search_text":"A neonate had a solid mass in the left side of the neck. Preoperative MRI of the mass was interpreted as showing an intact, well-defined tumor border, with the internal and external carotid arteries simply pushed laterally rather than involved, and no invasion of adjacent muscle or skull-base tissue. The two images provided are from that same preoperative MRI study of the mass: left = an axial (transverse) section through the mass; right = a sagittal section through the same mass showing its superior extent toward the skull base. At surgery, however, the tumor was found to have no discrete capsule and to encase (rather than simply displace) both the internal and external carotid arteries.\n\nBased only on these two images, which one contains an imaging feature that, in retrospect, was the more reliable clue that the tumor would prove to be non-encapsulated and vessel-encasing at surgery, and what specifically is that feature?\nCase: A neonate had a solid left neck mass. Preoperative MRI was interpreted as showing a well-defined, intact tumor border. The internal and external carotid arteries appeared displaced laterally rather than involved. There was no apparent invasion of adjacent muscle or skull-base tissue. At surgery, the tumor had no discrete capsule and encased both carotid arteries.\n\nImages: The left image is an axial (transverse) MRI through the mass. The right image is a sagittal MRI showing the mass’s superior extent toward the skull base.\n\nQuestion: Which image feature best predicted the non-encapsulated, vessel-encasing surgical finding?"},{"id":"q01-05e225564e2ccbe9","specialty":"Ophthalmology","type":"Investigation Interpretation","month":"2026-05","claude_score":0.0,"gemini_score":0.0,"title":"Ectopic Filtering Bleb After Ahmed Glaucoma Valve Implantation Treated With Transconjunctival Mattress Sutures: A Case Report","image_count":1,"has_response":false,"search_text":"An elderly man underwent revision surgery to reposition a valved glaucoma drainage implant, with the new implant plate placed under the conjunctiva in one quadrant of the eye via a posterior (pars-plana) approach. Six weeks later he developed a large, painless cystic conjunctival swelling in a different quadrant, remote from the implant, with intraocular pressure of 7 mmHg. The provided image shows two views of that eye obtained at this time: left, a slit-lamp photograph in which a dashed line outlines the cystic swelling and arrows trace the course of the drainage tube toward its posterior entry point; right, an anterior-segment OCT scan through the swelling, with an asterisk marking a well-defined hyporeflective cavity. Using the spatial relationship shown between the traced tube course and the cystic swelling, together with the fact that the swelling lies in a different quadrant from the implant plate, explain whether the fluid is most likely leaking along the tube's own insertion tract or is instead spreading from the distant implant plate through subconjunctival tissue planes, and justify your reasoning from the image.\nCase: An elderly man underwent revision surgery to reposition a valved glaucoma drainage implant. The revised implant used a posterior (pars plana) approach, with its plate beneath the conjunctiva in one quadrant. Six weeks later, a large, painless cystic conjunctival swelling developed in another quadrant, remote from the implant plate. His intraocular pressure was 7 mmHg.\n\nImages: Panel A is a slit-lamp photograph. The dashed line outlines the swelling, and the arrows trace the drainage tube toward its posterior entry site. Panel B is an anterior-segment OCT scan through the swelling. The asterisk marks a well-defined hyporeflective cavity.\n\nQuestion: What mechanism best explains the fluid collection: leakage along the tube’s insertion tract or subconjunctival spread from the implant plate?"},{"id":"q01-17609621bd3eed4a","specialty":"Ophthalmology","type":"Diagnosis","month":"2026-06","claude_score":0.0,"gemini_score":0.0,"title":"Late Postoperative Capsular Bag Distension Syndrome Presenting 15 Years After Surgery Successfully Treated With Neodymium-Doped Yttrium Aluminum Garnet Posterior Capsulotomy","image_count":2,"has_response":false,"search_text":"An older adult had cataract surgery with intraocular lens (IOL) implantation in one eye about 15 years earlier and now presents with progressively hazy vision in that eye over the past year. Visual acuity is mildly reduced but corrects well with pinhole, intraocular pressure is normal, and the anterior chamber shows no inflammation, cells, or hypopyon. There is no pain and no history of trauma or recent intraocular surgery. A prior attempt at a laser posterior capsulotomy (performed elsewhere) failed to relieve the haze. Two slit-lamp photographs of the affected eye are provided, taken at the same visit: the first (left) under diffuse illumination, the second (right) under a narrow slit beam through the same region. Based on these images together with the clinical findings above, what is the most likely diagnosis for the cause of this patient's visual haze, and what single feature visible in the images makes posterior capsule opacification an unlikely explanation instead?\nCase: An older adult underwent cataract surgery with intraocular lens implantation in one eye about 15 years ago. Over the past year, vision in that eye has become progressively hazy. Visual acuity is mildly reduced but improves well with pinhole. Intraocular pressure is normal. The anterior chamber has no inflammation, cells, or hypopyon. There is no pain or history of trauma or recent intraocular surgery. A previous laser posterior capsulotomy performed elsewhere did not relieve the haze.\n\nImages: Image 1 (left) uses diffuse illumination. Image 2 (right) uses a narrow slit beam through the same region at the same visit.\n\nQuestion: What is the most likely diagnosis?"},{"id":"q01-1a6b1f05f462cc0a","specialty":"Medical Genetics / Pediatric Neurology","type":"Mechanism","month":"2026-06","claude_score":0.0,"gemini_score":0.0,"title":"1q25.3–q32.1 deletion causing multisystem developmental delay: a case report and literature review","image_count":1,"has_response":false,"search_text":"A newborn boy had intrauterine growth restriction and was later found to carry a large de novo interstitial deletion of the long arm of chromosome 1, spanning roughly the 1q25.3 to 1q32.1 region (about 27 Mb), which removes dozens of protein-coding genes including DNM3 and ASTN1. He had normal thyroid function and no postnatal growth failure. The provided image is an axial brain MRI obtained during early childhood follow-up. Based on the imaging finding and the functions of the genes known to lie within this deleted interval, which specific deleted gene most plausibly accounts for the abnormality shown, and through what cellular mechanism does haploinsufficiency of that gene produce this finding?\nCase: A newborn boy had intrauterine growth restriction. Genetic testing found a de novo, approximately 27-Mb interstitial deletion of chromosome 1q25.3–q32.1. The deletion includes dozens of protein-coding genes, including DNM3 and ASTN1. Thyroid function was normal, and he had no postnatal growth failure.\n\nImages: The provided image is an axial brain MRI obtained during early-childhood follow-up.\n\nQuestion: What deleted-gene haploinsufficiency mechanism best explains the MRI abnormality?"},{"id":"q01-1cb587588e627391","specialty":"Hepatobiliary Surgery / Surgical Pathology","type":"Diagnosis","month":"2026-06","claude_score":0.0,"gemini_score":0.0,"title":"Rare Extrahepatic Metastasis of Hepatocellular Carcinoma to the Left Triangular Ligament: A Case Report","image_count":1,"has_response":false,"search_text":"A man in his 60s underwent laparoscopic resection for a 25-30 mm hepatic mass that showed arterial-phase hyperenhancement with delayed washout on CT (typical hepatocellular carcinoma [HCC] pattern), in the setting of a markedly elevated serum alpha-fetoprotein (tens of thousands of ng/mL, upper limit of normal <10 ng/mL). During mobilization of the liver, the surgeon incidentally found a second, flat white lesion embedded in the peritoneal fold that anchors the liver to the diaphragm (the left triangular ligament), clearly separate from the liver mass and not seen on any preoperative CT, MRI, or PET-CT. On final pathology, the intrahepatic mass was well- to moderately differentiated HCC, while the separate peritoneal-fold lesion was poorly differentiated HCC; both stained positive for a hepatocyte-specific immunohistochemical marker, confirming that both lesions are of hepatocellular origin. Two competing explanations for the peritoneal-fold lesion were considered: (1) an ectopic (heterotopic) primary HCC arising de novo from congenitally displaced liver tissue that happens to sit within this peritoneal fold, or (2) a deposit that spread there from the intrahepatic tumor (an isolated extrahepatic metastasis). The provided image shows: left, a low-power view of the entire resected specimen, with the smaller peritoneal-fold lesion marked with a single asterisk near the top and the larger intrahepatic tumor marked with a double asterisk below; right, a higher-magnification view of the boundary zone of the smaller lesion, showing the tumor (single asterisk) directly adjoining a band of fibrous connective tissue (marked with a dagger symbol), beyond which lies liver tissue with fatty change. Based on the differentiation-grade discordance between the two lesions and the histologic appearance of the boundary zone in the image, which of the two explanations is better supported, and what specific microscopic feature in the image supports it?\nCase: A man in his 60s had laparoscopic resection of a 25–30 mm liver mass with arterial hyperenhancement and delayed washout on CT, plus alpha-fetoprotein in the tens of thousands of ng/mL (normal <10). During liver mobilization, the surgeon found a separate flat white lesion in the left triangular ligament that had not appeared on preoperative CT, MRI, or PET-CT. The liver mass was well- to moderately differentiated HCC; the ligament lesion was poorly differentiated HCC. Both expressed a hepatocyte-specific marker.\n\nThe ligament lesion could be either a primary ectopic HCC arising from congenital heterotopic liver tissue or an isolated extrahepatic metastasis from the liver tumor.\n\nImages: The left low-power view shows the ligament lesion (*) above and the larger liver tumor (**) below. In the right boundary view, the ligament tumor (*) directly borders a fibrous band (†), with fatty liver tissue beyond the band.\n\nQuestion: Which explanation is better supported by the discordant tumor grades and boundary histology, and what specific microscopic feature supports it?"},{"id":"q01-28b2fb3e867f3052","specialty":"Pediatric Surgery","type":"Treatment","month":"2026-07","claude_score":0.0,"gemini_score":0.0,"title":"Pediatric colonic diverticulitis: clinical presentation, management, and review of the literature","image_count":2,"has_response":false,"search_text":"An adolescent boy underwent diagnostic laparoscopy for right lower quadrant pain that had recurred and worsened a day after an initial emergency visit, with white cell count 12x10^9/L and CRP 54 mg/L. Two intraoperative photographs from that operation are provided, in this order: left image shows the structure that prompted exploration; right image shows an adjacent structure in the same right lower quadrant. Based on the appearance of the structure in the right image and the overall clinical scenario (no perforation identified, anticipated need for outpatient endoscopic evaluation of the colon), what management decision should be made regarding the structure in the right image, and what is the main reason for that decision?\nCase: An adolescent boy underwent diagnostic laparoscopy for right lower quadrant pain that recurred and worsened one day after an initial emergency visit. His white cell count was 12 × 10^9/L, and CRP was 54 mg/L. No perforation was identified. Outpatient endoscopic evaluation of the colon was planned.\n\nImages: Image 1 (left) shows the structure that prompted exploration. Image 2 (right) shows an adjacent structure in the same right lower quadrant.\n\nQuestion: What is the appropriate management of the structure in the right image?"},{"id":"q01-3935461654311b15","specialty":"Cardiology","type":"Investigation Interpretation","month":"2026-06","claude_score":0.0,"gemini_score":0.0,"title":"Subacute Left Ventricular Free-Wall Rupture After Thrombolysis: From Concealed Rupture on CT to Successful Surgical Patch Repair","image_count":1,"has_response":false,"search_text":"A middle-aged heavy-smoker man developed sudden chest pain and the 12-lead ECG in the provided image was recorded at that time, before any reperfusion therapy. Based only on the pattern of ST-segment changes visible across the twelve leads shown, which coronary artery territory is being infarcted, and which specific coronary artery/branch is most likely the culprit vessel?\nCase: A middle-aged man with a history of heavy smoking developed sudden chest pain. A 12-lead ECG was recorded at that time, before reperfusion therapy.\n\nImages: Review the ST-segment changes across all 12 leads in the provided ECG.\n\nQuestion: Based only on this ECG, which coronary artery or branch is the most likely culprit vessel?"},{"id":"q01-40be7b1224f7f182","specialty":"Thoracic Pathology / Pulmonology","type":"Investigation Interpretation","month":"2026-04","claude_score":0.0,"gemini_score":0.0,"title":"Two Cases of Resected Bronchiolar Adenoma/Ciliated Muconodular Papillary Tumor Requiring Differentiation from Peripheral Lung Cancer","image_count":1,"has_response":false,"search_text":"A subcentimeter peripheral lung nodule was resected because primary lung cancer could not be excluded. The provided image shows two H&E-stained sections of the same surgical specimen at the same magnification: left is the intraoperative frozen section (evaluated immediately during surgery), and right is a section from the identical tissue block obtained after standard formalin fixation. Based on the intraoperative frozen section, the surgical team interpreted the lesion as adenocarcinoma, and no further oncologic resection was performed because of the patient's comorbidities and a planned limited surgical strategy. On the formalin-fixed section from the same tissue, a histologic feature became clearly appreciable that was not evident on the frozen section, and re-evaluation ultimately supported a benign diagnosis. (1) What histologic feature, seen on the right-hand section but not clearly on the left, changed the interpretation away from adenocarcinoma? (2) Why does this feature tend to be difficult to identify specifically on intraoperative frozen sections?\nCase: A subcentimeter peripheral lung nodule was resected because primary lung cancer could not be excluded. The intraoperative frozen section was interpreted as adenocarcinoma. Re-evaluation of formalin-fixed tissue from the same block supported a benign diagnosis.\n\nImages: Both panels are H&E-stained sections at the same magnification. Panel A is the intraoperative frozen section. Panel B is the formalin-fixed section from the same tissue block.\n\nQuestion: What feature in panel B changed the interpretation, and why is it difficult to identify on frozen sections?"},{"id":"q01-50cbf7b3507ad803","specialty":"Thoracic Trauma Surgery","type":"Investigation Interpretation","month":"2026-05","claude_score":0.0,"gemini_score":0.0,"title":"Intercostal nerve cryoablation for control of pain after sternal fracture repair: A case series","image_count":2,"has_response":false,"search_text":"The provided images are preoperative sagittal chest CT reconstructions from two different adult trauma patients, each with a displaced sternal fracture that was subsequently treated with open reduction, plate fixation, and intercostal nerve cryoablation at the fracture level plus one interspace above and one below, performed bilaterally. The first image is from one patient; the second image is from the other. Clinically, one of these two patients reported painful popping and clicking in the central chest with breathing and had visible paradoxical (out-of-phase) movement of the upper versus lower sternal segments during the respiratory cycle on exam. The other patient had equally severe sternal pain unrelieved by multimodal analgesia, but denied any clicking sensation and had no paradoxical chest wall movement on exam. Based on the fracture morphology visible in each image, which image corresponds to the patient with the clicking, paradoxically moving sternum, and what specific feature of that fracture pattern mechanically explains why it produces a flail, unstable segment while the other pattern does not?\nCase: Two adult trauma patients had equally severe pain from displaced sternal fractures. One reported painful popping and clicking in the central chest with breathing. Examination showed visible out-of-phase movement of the upper and lower sternal segments during respiration. The other had severe sternal pain despite multimodal analgesia but denied clicking and had no paradoxical chest wall movement.\n\nImages: Images 1 and 2 are preoperative sagittal chest CT reconstructions, one from each patient.\n\nQuestion: What mechanical difference between the fracture patterns identifies the image from the patient with clicking and paradoxical sternal motion?"},{"id":"q01-717a21bb8f6e2090","specialty":"Dermatopathology / Infectious Disease","type":"Investigation Interpretation","month":"2026-05","claude_score":0.0,"gemini_score":0.0,"title":"Metagenomic identification of Acanthamoeba Rhysodes in chronic skin lesion: Case report and literature review","image_count":2,"has_response":false,"search_text":"A patient has a 3-year chronic, refractory ulcerative neck plaque that was initially misdiagnosed as tuberculosis and treated with a 3-month course of antitubercular therapy without improvement. Special stains for acid-fast bacilli (Ziehl-Neelsen) and fungal elements (Grocott-Gomori) were negative on skin biopsy. Fresh tissue metagenomic sequencing (targeting bacterial 16S, fungal ITS, and parasitic 18S rRNA genes) later found a parasite at 67% relative abundance, Staphylococcus aureus at 60% relative abundance, and a Candida species at only 9% relative abundance (this last finding matched a prior tissue culture also positive for Candida). This prompted a targeted re-review of the original hematoxylin-eosin slides. Two images from that re-review are provided: the left image is a lower-magnification view of the granulomatous infiltrate (arrow marks a structure within it), and the right image is a higher-magnification view of a separate field (arrow marks a distinct structure). Based on the morphology visible in these images together with the case data above, what organism (genus level) is the arrow indicating in the right-hand image, and what specific morphologic feature(s) visible in the image distinguish it from the multinucleated giant cell indicated in the left-hand image?\nCase: A chronic, refractory ulcerative neck plaque has persisted for 3 years. It was treated as tuberculosis for 3 months without improvement.\n\nZiehl-Neelsen and Grocott-Gomori stains of a skin biopsy were negative for acid-fast bacilli and fungi. Fresh-tissue metagenomic sequencing targeted bacterial 16S, fungal ITS, and parasitic 18S rRNA genes. It detected a parasite at 67% relative abundance, Staphylococcus aureus at 60%, and Candida at 9%. The Candida finding matched a previous tissue culture.\n\nImages: The images are from re-review of the original hematoxylin-eosin slides. Image 1 is a lower-magnification view of the granulomatous infiltrate; the arrow marks a multinucleated giant cell. Image 2 is a higher-magnification view of a separate field; the arrow marks a distinct structure.\n\nQuestion: Which organism, at the genus level, is indicated by the arrow in Image 2?"},{"id":"q01-83d2ae1a08385ed9","specialty":"Thoracic Radiology","type":"Investigation Interpretation","month":"2026-04","claude_score":0.0,"gemini_score":0.0,"title":"Thoracoscopic Resection of a Bronchial Artery Aneurysm Mimicking Mediastinal Lymph Node Metastasis after Surgery for Papillary Thyroid Cancer: A Case Report","image_count":2,"has_response":false,"search_text":"The two images below are axial CT sections of the same subcarinal mediastinal mass (marked by arrowheads) in a 68-year-old man under surveillance after thyroid cancer surgery. Left: non-contrast CT obtained at the time of the original thyroid surgery. Right: contrast-enhanced CT obtained about 2 years later, by which time the mass had enlarged slightly and developed a thin peripheral rim of calcification. On the right-hand (contrast-enhanced) image, the adjacent mediastinal vessels and cardiac chambers opacify brightly, but the region marked by the arrowheads inside the mass stays uniformly gray and does not brighten with contrast. Throughout this period, serum thyroglobulin remained within the normal range and PET showed only mildly increased FDG uptake, findings that were judged insufficient on their own to exclude nodal metastasis. Explain what process inside the lesion most likely accounts for the lack of contrast opacification in the marked region, and state what this implies about the true nature of the mass.\nCase: A 68-year-old man was under surveillance after thyroid cancer surgery. A subcarinal mediastinal mass enlarged slightly over about 2 years and developed a thin peripheral rim of calcification. Serum thyroglobulin remained normal. PET showed only mildly increased FDG uptake, so nodal metastasis could not be excluded.\n\nImages: Image 1 is non-contrast CT obtained at the time of surgery. Image 2 is contrast-enhanced CT obtained about 2 years later. Arrowheads mark the same mass. In Image 2, adjacent mediastinal vessels and cardiac chambers enhance brightly, but the marked region within the mass remains uniformly gray without enhancement.\n\nQuestion: What diagnosis explains the lack of contrast enhancement in the marked region?"},{"id":"q01-87481e84be72acae","specialty":"Hepatobiliary Surgery / Abdominal Radiology","type":"Diagnosis","month":"2026-06","claude_score":0.0,"gemini_score":0.0,"title":"Mesenchymal hamartoma of the liver in a young adult female: a diagnostic challenge mimicking hepatic adenoma","image_count":1,"has_response":false,"search_text":"A woman in her early 30s with a decade-plus history of combined oral contraceptive use was found to have a solid, well-circumscribed hyperechoic mass in the posterior right liver that grew from about 2 cm to about 7 cm within one year. Serum alpha-fetoprotein, PIVKA-II/DCP, carcinoembryonic antigen, and CA19-9 were all normal, and biopsy was avoided because of concern for tumor dissemination. Contrast-enhanced CT showed a well-circumscribed mass with heterogeneous internal enhancement that increased gradually from the arterial phase to the delayed phase, rather than showing early arterial hyperenhancement with subsequent washout. Because of her contraceptive history, a benign hepatocellular tumor (such as hepatocellular adenoma) was initially favored. The provided image shows gadoxetic-acid-enhanced MRI of the same mass, in this order: left panel = hepatobiliary phase, middle panel = diffusion-weighted imaging, right panel = T2-weighted imaging. Using the clinical and CT information together with the appearance of the mass on each of the three MRI sequences shown, state the single most likely underlying diagnosis for this liver lesion, and identify the specific hepatobiliary-phase feature visible in the image that argues against a typical hepatocellular adenoma or focal nodular hyperplasia.\nCase: A woman in her early 30s had used combined oral contraceptives for more than 10 years. A solid, well-circumscribed hyperechoic mass in the posterior right liver grew from about 2 cm to about 7 cm within one year.\n\nSerum alpha-fetoprotein, PIVKA-II/DCP, carcinoembryonic antigen, and CA19-9 were normal. Biopsy was avoided because of concern about tumor dissemination.\n\nContrast-enhanced CT showed a well-circumscribed mass with heterogeneous internal enhancement that gradually increased from the arterial phase to the delayed phase. It did not show early arterial hyperenhancement followed by washout. Her contraceptive history initially suggested a benign hepatocellular tumor such as hepatocellular adenoma.\n\nImages: Gadoxetic-acid-enhanced MRI of the same mass. The left panel is the hepatobiliary phase, the middle panel is diffusion-weighted imaging, and the right panel is T2-weighted imaging.\n\nQuestion: What is the most likely diagnosis?"},{"id":"q01-8975369c944dd1eb","specialty":"Interventional Cardiology / Coronary Artery Disease","type":"Investigation Interpretation","month":"2026-03","claude_score":0.0,"gemini_score":0.0,"title":"Spontaneous Coronary Artery Dissection in Complex Congenital Coronary Anatomy","image_count":1,"has_response":true,"search_text":"A woman in her 60s with no traditional cardiovascular risk factors presented with acute chest pain at rest. Coronary imaging later showed that her right coronary artery, left anterior descending artery (LAD), and a small left circumflex artery (LCx) all arose from a single ostium in one aortic sinus. An intimal dissection flap was present in that shared sinus and extended into the LCx, and a separate dissecting flap was found in the mid-to-distal LAD. The provided image shows two 12-lead ECG tracings recorded from this patient at different times, both displayed with standard limb and precordial lead labels: left, recorded immediately before invasive coronary angiography; right, recorded immediately after the angiography procedure. Comparing the right-hand tracing with the left-hand tracing, which myocardial territory shows a new or previously non-dominant pattern of active ischemic change, and which of the two dissected coronary territories (LAD vs LCx) does this newly implicated territory correspond to?\nCase: A woman in her 60s with no traditional cardiovascular risk factors presented with acute chest pain at rest. Coronary imaging showed that the RCA, LAD, and a small LCx arose from one ostium in a single aortic sinus. An intimal dissection flap in the shared sinus extended into the LCx. A separate dissection flap involved the mid-to-distal LAD.\n\nImages: The left 12-lead ECG was recorded immediately before invasive coronary angiography. The right ECG was recorded immediately afterward.\n\nQuestion: What new ischemic territory appears after angiography, and does it correspond to the LAD or LCx dissection?"},{"id":"q01-89772325c8f447bc","specialty":"Dermatopathology","type":"Diagnosis","month":"2026-05","claude_score":0.0,"gemini_score":0.0,"title":"Five primary melanomas in situ in a patient with recent tanning bed use, melanotan exposure, and anabolic hormone use","image_count":2,"has_response":false,"search_text":"A man in his late 40s developed rapid darkening of multiple pre-existing trunk nevi within about a week of starting daily injections of a synthetic melanocortin-receptor agonist (used off-label for cosmetic tanning), overlapping with a several-week course of intensive tanning-bed sessions. Two to three weeks later, five clinically atypical pigmented lesions were biopsied. The provided image shows two views of one excised lesion from this patient: left, a low-power view spanning the epidermis and superficial dermis; right, a higher-power view of the atypical proliferation at the dermal-epidermal junction. Immunostaining of this lesion (not shown) demonstrated diffuse junctional melanocyte marker positivity plus PRAME nuclear positivity restricted to a subset of the atypical melanocytes. Based on the architectural and cytologic features visible in the image together with the immunostaining pattern described, what is the diagnosis, and what is the single feature in the image most responsible for distinguishing this diagnosis from a benign (non-dysplastic) nevus?\nCase: A man in his late 40s developed rapid darkening of multiple pre-existing trunk nevi within about one week of starting daily injections of a synthetic melanocortin-receptor agonist for cosmetic tanning. This exposure overlapped with several weeks of intensive tanning-bed use. Two to three weeks later, five clinically atypical pigmented lesions were biopsied.\n\nImages: Image 1 is a low-power view of one excised lesion, spanning the epidermis and superficial dermis. Image 2 is a higher-power view of the atypical proliferation at the dermal-epidermal junction. Immunostaining, not shown, demonstrated diffuse junctional melanocyte-marker positivity and PRAME nuclear positivity in a subset of the atypical melanocytes.\n\nQuestion: What is the diagnosis?"},{"id":"q01-8cbf3464bfa665a7","specialty":"Cardiovascular Radiology","type":"Investigation Interpretation","month":"2026-07","claude_score":0.0,"gemini_score":0.0,"title":"Incidentally detected double-chambered right ventricle in an adult","image_count":1,"has_response":false,"search_text":"The provided image is a short-axis late-gadolinium-enhancement cardiac MRI slice through the right ventricle in an adult with an incidentally discovered right ventricular outflow obstruction. An arrow marks a discrete muscular band crossing the ventricular cavity. Additional workup in the same patient found: a right ventricular outflow tract peak pressure gradient of 28 mmHg, a peak flow velocity of 263 cm/s across the obstruction, and no ventricular septal defect on the full MRI study. Based on the anatomic feature marked in the image together with the hemodynamic and structural findings, state which of the two recognized subtypes of muscular right-ventricular intracavitary obstruction this represents, and explain the single anatomic criterion that distinguishes the two subtypes.\nCase: An adult has an incidentally discovered right ventricular outflow obstruction. The right ventricular outflow tract peak pressure gradient is 28 mmHg. Peak flow velocity across the obstruction is 263 cm/s. The full MRI study shows no ventricular septal defect.\n\nImages: The supplied short-axis late-gadolinium-enhancement cardiac MRI slice through the right ventricle shows an arrow marking a discrete muscular band crossing the ventricular cavity.\n\nQuestion: Which of the two recognized subtypes of muscular right ventricular intracavitary obstruction is present?"},{"id":"q01-8ce59f02edba1909","specialty":"Dermatology/Dermatopathology","type":"Investigation Interpretation","month":"2026-06","claude_score":0.0,"gemini_score":0.0,"title":"Nevoid follicular epidermolytic hyperkeratosis in a blaschkoid epidermal nevus","image_count":2,"has_response":false,"search_text":"An adult has a longstanding unilateral eruption following the lines of Blaschko: densely packed, monomorphic, rusty-to-skin-colored scaly papules centered on hair follicles, with sparing of the skin between follicles (giving a keratosis-pilaris-like look rather than confluent plaques). Two images are provided, in this order: (1) a close-up clinical photograph of one of the affected skin regions, and (2) a high-power hematoxylin-eosin-stained photomicrograph of a punch biopsy taken from a different affected skin site. Based on the epithelial changes visible in image 2 and the clinical pattern shown in image 1, (a) name the specific histopathologic pattern present, and (b) state the single most important feature visible in image 2 that argues against the leading clinical/histologic mimic for this papular, follicular, Blaschko-distributed eruption, and name that mimic.\nCase: An adult has a longstanding unilateral eruption along the lines of Blaschko. Densely packed, monomorphic, rusty-to-skin-colored scaly papules are centered on hair follicles. The skin between follicles is spared, producing a keratosis-pilaris-like appearance rather than confluent plaques.\n\nImages:\n1. Clinical close-up of an affected skin region.\n2. High-power hematoxylin-eosin photomicrograph of a punch biopsy from a different affected site.\n\nQuestion: What specific histopathologic pattern is present in image 2?"},{"id":"q01-95f1240384e9ef58","specialty":"Neuroradiology / Critical Care Neurology","type":"Investigation Interpretation","month":"2026-04","claude_score":0.0,"gemini_score":0.0,"title":"Pulseless Electrical Activity Arrest in End-Stage Heart Failure Complicated by Cocaine-Associated Cardiotoxicity and Cerebellar Infarction: A Post-resuscitation Diagnostic Pitfall","image_count":2,"has_response":false,"search_text":"The provided images are two non-contrast axial brain scans from the same patient, obtained after a prolonged pulseless electrical activity arrest (about 16 minutes of resuscitation before return of spontaneous circulation). First image: CT performed on hospital day 2. Second image: MRI performed on hospital day 4; the MRI had been delayed because of ongoing hemodynamic instability and vasopressor dependence. CT angiography of the posterior circulation performed around the same time as the CT showed a patent posterior circulation without large-vessel occlusion. Using both images together with this information, explain the most likely reason for the discrepancy between the two studies, and state what conclusion should NOT be drawn about this patient's brain injury from the negative MRI finding alone.\nCase: A patient had a prolonged pulseless electrical activity arrest, requiring about 16 minutes of resuscitation before return of spontaneous circulation. Posterior-circulation CT angiography around hospital day 2 showed patent vessels without large-vessel occlusion. Brain MRI on hospital day 4 was delayed because of ongoing hemodynamic instability and vasopressor dependence.\n\nImages:\n- Image 1: Noncontrast axial head CT on hospital day 2.\n- Image 2: Noncontrast axial brain MRI on hospital day 4.\n\nThe arrows identify the region being compared. The later MRI does not show the abnormality seen on CT.\n\nQuestion: What is the correct interpretation of the discordant CT and MRI findings in this patient's brain injury assessment?"},{"id":"q01-9c68d16af44226c6","specialty":"Pediatric Cardiology / Electrophysiology","type":"Investigation Interpretation","month":"2026-06","claude_score":0.0,"gemini_score":0.0,"title":"A Novel KCNJ2 p.Glu299Ala Variant Associated with Short QT Phenotype and Persistent Atrial Fibrillation in a Child","image_count":1,"has_response":false,"search_text":"The provided image is a 12-lead ECG tracing (leads I, II, III, aVR, aVL, aVF, V1-V6, plus a rhythm strip) recorded during a diagnostic evaluation in a pediatric patient. Based only on what is visible in the tracing, (a) name the atrial rhythm indicated by the beat-to-beat pattern, and (b) describe the abnormality in the ST-T segment morphology that is present across most leads.\nCase: A pediatric patient had a 12-lead ECG during a diagnostic evaluation.\n\nImages: The tracing shows leads I, II, III, aVR, aVL, aVF, V1–V6, and a lead II rhythm strip.\n\nQuestion: What is the atrial rhythm?"},{"id":"q01-aa98cd7ca91ebfd8","specialty":"Cardiology","type":"Investigation Interpretation","month":"2026-06","claude_score":0.0,"gemini_score":0.0,"title":"Heat Stroke or Acute Coronary Syndrome? A Summer Collapse With an Unexpected Cardiac Twist","image_count":1,"has_response":false,"search_text":"The provided image is a 12-lead ECG with rhythm strips, recorded in the emergency department from a 60-year-old man shortly after he was found unresponsive outdoors on a hot day (pre-hospital core temperature above 42°C, initial reduced consciousness that improved rapidly with active cooling). In the lead II strip, two adjacent segments of a single complex are shaded and marked by arrows labeled A and B. Based on the tracing itself, name the specific ECG abnormality each arrow is highlighting (not just \"abnormal\"), and state whether an isolated finding of this pattern, occurring without any ST-segment or T-wave changes of ischaemia, is more typical of primary coronary plaque rupture or of a systemic/metabolic disturbance such as severe hyperthermia.\nCase: A 60-year-old man was found unresponsive outdoors on a hot day. His prehospital core temperature was above 42°C. His reduced consciousness improved rapidly with active cooling.\n\nImages: The image shows the 12-lead ECG and rhythm strips recorded in the emergency department shortly afterward. In lead II, arrows A and B mark shaded segments of the tracing. No ischemic ST-segment or T-wave changes are present.\n\nQuestion: What abnormality does each arrow mark, and does this isolated pattern favor plaque rupture or a systemic/metabolic disturbance?"},{"id":"q01-ae68dad62bf74319","specialty":"Hepatology/Gastroenterology","type":"Diagnosis","month":"2026-06","claude_score":0.0,"gemini_score":0.0,"title":"Syphilis Infection Triggering Autoimmune Hepatitis","image_count":1,"has_response":false,"search_text":"A man presented with a diffuse rash, systemic symptoms, and abnormal liver tests. Serology confirmed active syphilis (reactive treponemal antibody, rapid plasma reagin 1:512). Autoantibody testing showed antismooth muscle antibody 1:320 and antimitochondrial antibody (AMA)-M2 183.6 U (reference <20), with markedly elevated IgG (3,250 mg/dL; reference 700-1,600). Liver tests showed a mixed hepatocellular-cholestatic pattern with alkaline phosphatase (ALP) elevated out of proportion to the transaminases. The provided image is a hematoxylin-and-eosin-stained photomicrograph of a liver biopsy obtained from this patient around this time. Based on the composition of the inflammatory infiltrate and the structural findings that are present or absent in the image, which single diagnosis best explains this presentation: autoimmune hepatitis (AIH) alone, isolated syphilitic hepatitis, or a true AIH-primary biliary cholangitis overlap syndrome? Justify your choice using specific features visible in the image together with the serologic pattern above.\nCase: A man presented with a diffuse rash and systemic symptoms. Testing confirmed active syphilis, with a reactive treponemal antibody and rapid plasma reagin titer of 1:512. Antismooth muscle antibody was 1:320, and AMA-M2 was 183.6 U (reference <20). IgG was 3,250 mg/dL (reference 700–1,600). Liver tests showed a mixed hepatocellular-cholestatic pattern, with alkaline phosphatase elevated out of proportion to the transaminases.\n\nImages: The image is an H&E-stained photomicrograph of a liver biopsy obtained during this presentation. Consider the inflammatory infiltrate’s composition and the presence or absence of structural findings.\n\nQuestion: Which diagnosis best explains the findings: autoimmune hepatitis alone, isolated syphilitic hepatitis, or true autoimmune hepatitis–primary biliary cholangitis overlap syndrome?"},{"id":"q01-af0841ba9175fc59","specialty":"Otolaryngology / Neurotology","type":"Investigation Interpretation","month":"2026-06","claude_score":0.0,"gemini_score":0.0,"title":"Cochlear Implantation Following Neurobrucellosis-Related Bilateral Profound Sensorineural Hearing Loss: A Case Report and Literature Review","image_count":1,"has_response":false,"search_text":"A man with a two-year history of progressive bilateral hearing loss following a confirmed CNS bacterial infection (treated with antibiotics roughly two years earlier, with documented microbiological remission) developed bilateral profound sensorineural hearing loss that did not improve after a six-month trial of binaural hearing aids. Cochlear implantation of one ear was being considered. Before surgery, right temporal bone imaging was obtained; the provided image shows this preoperative imaging, with the left panel an axial high-resolution CT and the right panel an axial T2-weighted MRI, both centered on the same red-circled region of the inner ear. Based on the appearance of the cochlear scalae (fluid-filled channels) on CT and the cochlear fluid signal on MRI in the provided image, describe the key structural finding these two images demonstrate, and explain how that finding predicts whether a lateral-wall electrode array could be advanced through the round window to a full-length, atraumatic insertion versus requiring a modified surgical strategy (such as partial insertion or a different electrode).\nCase: A man developed progressive bilateral hearing loss after a confirmed CNS bacterial infection treated with antibiotics about two years earlier. Microbiological remission was documented. His hearing loss progressed over two years to bilateral profound sensorineural hearing loss. Six months of binaural hearing aids provided no improvement. Cochlear implantation of one ear was being considered.\n\nImages: Preoperative right temporal bone imaging is shown. Panel A is an axial high-resolution CT, and panel B is an axial T2-weighted MRI. Both panels show the same red-circled inner-ear region. The relevant features are the cochlear scalae and cochlear fluid signal.\n\nQuestion: What combined CT and MRI interpretation determines whether full-length, atraumatic round-window insertion of a lateral-wall array is feasible or partial insertion or another electrode is needed?"},{"id":"q01-bd4ab2ad6ce0ddb8","specialty":"Vascular/Neuroradiology","type":"Investigation Interpretation","month":"2026-05","claude_score":0.0,"gemini_score":0.0,"title":"Double vertebral artery-connected persisting proatlantal artery coexisting with a persisting carotid duct in an adult case: first evidence","image_count":1,"has_response":false,"search_text":"The provided image is a single oblique 2D slice from a cervical CT angiogram (right side) in an adult man, viewed from the front. It shows the region of the carotid bifurcation: a widened vessel divides into one branch that continues well opacified with contrast cranially, and a second branch that shows a short (~4 mm) segment with no contrast filling immediately after its origin (marked by the arrow); this second branch is expected to resume filling with contrast further downstream, outside this frame.\n\nAdditional CTA findings in the same patient's right neck (not shown in the image): a separate 8-mm-diameter vessel arises directly from the subclavian artery, ascends posterior to the internal jugular vein and then posterior to the well-opacified carotid branch, loops near the root of the atlas transverse process, and descends again to terminate exactly at the point where the poorly-filling branch resumes opacification more distally.\n\nBased on the image together with this description: (1) name the artery whose proximal segment fails to opacify (arrow) in the image, and (2) name the specific embryological vascular remnant that is acting as the collateral feeder reconstituting its distal segment in this patient.\nCase: An adult man underwent CT angiography of the right neck. Additional CTA findings show a separate 8-mm vessel arising directly from the subclavian artery. It ascends posterior to the internal jugular vein and then posterior to the well-opacified carotid branch. It loops near the root of the atlas transverse process, descends, and terminates where the poorly opacified branch resumes filling.\n\nImages: The supplied image is a frontal view of a single oblique 2D slice through the right carotid bifurcation. A widened vessel divides into two branches. One branch remains well opacified cranially. The other has an approximately 4-mm non-opacified segment immediately after its origin, marked by the arrow, and resumes filling farther downstream outside the image.\n\nQuestion: Which artery has the non-opacified proximal segment, and which embryological vascular remnant reconstitutes its distal segment?"},{"id":"q01-c138202ea4d2c97f","specialty":"Breast Radiology","type":"Investigation Interpretation","month":"2026-06","claude_score":0.0,"gemini_score":0.0,"title":"Surgical Management of Posttraumatic Breast Bisection Following Seat Belt Injury: A Series of 3 Cases and Technique Description","image_count":1,"has_response":false,"search_text":"The provided image shows two mammographic views of the same breast, obtained in a woman in her sixties who presented several months after blunt seat-belt trauma to the chest with a palpable, firm area underlying a linear scar-like deformity of the breast. Left: one projection; right: a second projection of the same lesion. No skin retraction, nipple discharge, or axillary lymphadenopathy was present, and a preceding hematoma had already resolved. Based on the margin and density characteristics visible in the image, is this appearance more consistent with a benign post-traumatic process or with malignancy, and what two specific imaging features from the image support your answer?\nCase: A woman in her sixties presented several months after blunt seat-belt trauma to the chest. She had a firm, palpable area beneath a linear, scar-like breast deformity. A preceding hematoma had resolved. There was no skin retraction, nipple discharge, or axillary lymphadenopathy. The differential was benign post-traumatic change versus malignancy.\n\nImages: The left and right panels show two mammographic projections of the same breast and lesion.\n\nQuestion: What is the most likely diagnosis, and which two visible mammographic features support it?"},{"id":"q01-c8e103d3a68435cf","specialty":"Oral and Maxillofacial Pathology / Infectious Disease","type":"Diagnosis","month":"2026-07","claude_score":0.0,"gemini_score":0.0,"title":"Oral Diagnosis of Lepromatous Leprosy in a Hyperendemic Region of Brazil","image_count":1,"has_response":false,"search_text":"An adolescent/young adult male from a leprosy-hyperendemic region presents with a several-month history of widespread, smooth-surfaced, skin-colored to erythematous papulonodular lesions on the face (with nasal enlargement and alar distortion) and on the dorsal surfaces of the fingers/periarticular regions (some with digital deformity), plus recurrent swelling and prolonged bleeding after minor trauma at an intraoral site. Critically, he denies any pain or sensory impairment at any of these sites, and routine laboratory studies are unremarkable. The provided image shows, from left to right: (a) the perioral/nasal facial skin, (b) the dorsal hand and fingers, and (c) the intraoral palate at the same clinical presentation. Differential diagnoses under consideration include a granulomatous mycobacterial infection, mucocutaneous leishmaniasis, tuberculosis, and paracoccidioidomycosis. Reconciling the distribution of lesions (facial, acral/periarticular, and palatal), the preserved sensation despite extensive skin and joint-adjacent involvement, and the unremarkable baseline labs, what is the single most likely underlying diagnosis?\nCase: An adolescent or young adult man from a leprosy-hyperendemic region has had widespread lesions for several months. The lesions are smooth, skin-colored to erythematous papules and nodules. Facial findings include nasal enlargement and alar distortion. Lesions involve the dorsal fingers and periarticular regions, with some digital deformity. An intraoral lesion has recurrent swelling and prolonged bleeding after minor trauma. He has no pain or sensory impairment at any involved site. Routine laboratory studies are unremarkable.\n\nImages: From left to right: (a) the perioral and nasal lesions, (b) the dorsal hand and finger lesions, and (c) the palatal lesion at the same presentation.\n\nThe differential diagnoses include a granulomatous mycobacterial infection, mucocutaneous leishmaniasis, tuberculosis, and paracoccidioidomycosis.\n\nQuestion: What is the single most likely diagnosis?"},{"id":"q01-d02dccb2e4497bb6","specialty":"General/Abdominal Wall Surgery","type":"Diagnosis","month":"2026-06","claude_score":0.0,"gemini_score":0.0,"title":"Laparoscopic Intraperitoneal Onlay Mesh Plus Repair of a Hernia Adjacent to a Vesicocutaneous Urinary Diversion: A Case Report","image_count":1,"has_response":false,"search_text":"A man in his mid-70s had previously undergone laparoscopic abdominoperineal resection for rectal cancer with prostatic invasion, combined with robot-assisted radical prostatectomy. During that same operation, a vesicocutaneous fistula was deliberately created as a salvage urinary diversion (bladder exteriorized through the right rectus abdominis muscle) because prior pelvic radiotherapy (a total dose of 78 Gy for prostate cancer years earlier) made urethral reanastomosis high risk. He later developed localized pain near the fistula. The provided image is a sagittal contrast-enhanced abdominal CT obtained at this point, before any repair; the arrows mark a focal defect/outpouching of the abdominal wall, and the dotted line outlines the urinary bladder. At subsequent surgery, this defect was found on the cranial side of the bladder, was anatomically distinct from both the separate sigmoid colostomy site and from any prior laparoscopic port sites, and no adhesions were found between the bladder and surrounding organs. In one to two sentences, state whether this abdominal wall defect should be classified as a parastomal hernia or as an incisional hernia, and give the single strongest anatomic reason for that classification.\nCase: A man in his mid-70s underwent laparoscopic abdominoperineal resection for rectal cancer with prostatic invasion and robot-assisted radical prostatectomy. During the same operation, surgeons created a vesicocutaneous fistula for urinary diversion by exteriorizing the bladder through the right rectus abdominis. This was done because prior 78 Gy pelvic radiotherapy made urethral reanastomosis high risk. He later developed localized pain near the fistula.\n\nImages: The sagittal contrast-enhanced abdominal CT was obtained before repair. The arrows mark a focal abdominal wall defect and outpouching. The dotted line outlines the urinary bladder.\n\nAt surgery, the defect was cranial to the bladder. It was separate from the sigmoid colostomy and all previous laparoscopic port sites. There were no adhesions between the bladder and surrounding organs.\n\nQuestion: Should this defect be classified as a parastomal or incisional hernia?"},{"id":"q01-d1758a3536b1695f","specialty":"Cardio-oncology","type":"Diagnosis","month":"2026-03","claude_score":0.0,"gemini_score":0.0,"title":"Case Report: A case of right ventricular metastasis from cervical cancer presenting with thrombocytopenia: the role of echocardiography and myocardial contrast echocardiography","image_count":2,"has_response":true,"search_text":"A woman in her early 60s had cervical squamous intraepithelial neoplasia (CIN II-III) with only focal early invasion (depth 1 mm), treated by hysterectomy about 11 years earlier; she had been disease-free since. She now presents with two problems: (1) thrombocytopenia that had been worked up extensively by hematology without ever finding a primary blood disorder, and (2) respiratory symptoms (cough, blood-streaked sputum, chest tightness, exertional dyspnea; no fever or chest pain). Echocardiography and myocardial contrast echocardiography (MCE) of the heart are provided as images (left: grayscale echo; right: MCE cross-sectional view of the same mass). Pulmonary artery systolic pressure was elevated at 54 mmHg. CT pulmonary angiography confirmed a filling defect occupying the right ventricle/pulmonary artery lumen, with an indistinct interface between the lesion and the ventricular wall. Before any cardiac surgery, a comprehensive whole-body imaging work-up (chest, abdomen, and pelvic CT; cranial CT; contrast-enhanced pelvic MRI) found no other mass or lesion anywhere in the body outside the heart. The mass was surgically resected. Pathology showed a moderately-to-poorly differentiated squamous cell carcinoma. Immunohistochemistry showed CK7 with mixed/heterogeneous staining, P40 negative, P16 negative, a high Ki-67 proliferation index (about 80%), and PD-L1 with a combined positive score under 1. After resection, the platelet count normalized to normal and stayed normal with no further cancer treatment given. Is this right ventricular squamous cell carcinoma best explained as a very late metastatic recurrence of her original cervical carcinoma, or as an independent second primary squamous cell carcinoma (for example, of the lung) that happened to spread to the heart? State which is more likely and justify your answer using the imaging, the pathology/immunohistochemistry pattern, and the platelet-count course.\nCase: A woman in her early 60s had CIN II–III with focal 1-mm invasion treated by hysterectomy about 11 years earlier and remained disease-free. She later developed unexplained thrombocytopenia and cough, blood-streaked sputum, chest tightness, and exertional dyspnea, without fever or chest pain. Pulmonary artery systolic pressure was 54 mmHg. CT pulmonary angiography showed a filling defect in the right ventricle/pulmonary artery with an indistinct interface with the ventricular wall. Before cardiac surgery, chest, abdominal, pelvic, and cranial CT plus contrast pelvic MRI found no lesion outside the heart.\n\nThe mass was resected. It was a moderately-to-poorly differentiated squamous cell carcinoma with heterogeneous CK7 staining, negative P40 and P16, Ki-67 about 80%, and PD-L1 combined positive score <1. Her platelet count then normalized and remained normal without further cancer therapy.\n\nImages: The first image is grayscale echocardiography of the mass; the second is a myocardial contrast echocardiography cross-section of the same mass.\n\nQuestion: Is this right ventricular carcinoma more likely a very late metastasis of the cervical carcinoma or a second primary squamous carcinoma, such as lung cancer, that spread to the heart? Justify one choice using the imaging survey, pathology/immunohistochemistry, and platelet-count course."},{"id":"q01-d67bb660cab412e9","specialty":"Oral and Maxillofacial Pathology","type":"Diagnosis","month":"2026-06","claude_score":0.0,"gemini_score":0.0,"title":"A Glandular Odontogenic Cyst Mimicking a Dentigerous Cyst: A Diagnostic Pitfall","image_count":1,"has_response":false,"search_text":"A 29-year-old woman presented with pain and trismus related to an impacted lower-right third molar. Cone-beam CT showed a well-defined ovoid radiolucency (approximately 14 x 15 x 10 mm) surrounding the crown of the impacted tooth, attached at the cemento-enamel junction, and extending to the distal root of the adjacent second molar; that adjacent tooth showed no root resorption or caries. Based on this pericoronal appearance and cemento-enamel-junction attachment, the lesion was provisionally called a dentigerous cyst. At surgery, the enucleated cystic lining was found grossly continuous with the cervical portion of the impacted tooth's crown - again a pattern typical of a dentigerous cyst. The provided image is a high-power (400x), unlabeled hematoxylin-and-eosin-stained photomicrograph of the resected cyst lining. Based on the epithelial architecture visible in the image, what is the most likely histopathologic diagnosis, and why do the radiographic appearance and the gross continuity described above fail to distinguish this diagnosis from an ordinary dentigerous cyst?\nCase: A 29-year-old woman had pain and trismus related to an impacted lower-right third molar. Cone-beam CT showed a well-defined ovoid pericoronal radiolucency measuring approximately 14 × 15 × 10 mm. It surrounded the impacted tooth’s crown, attached at the cemento-enamel junction, and extended to the distal root of the adjacent second molar. The adjacent tooth had no root resorption or caries. These findings led to a provisional diagnosis of a dentigerous cyst.\n\nAt surgery, the enucleated cyst lining was grossly continuous with the cervical portion of the impacted tooth’s crown. This pattern was also typical of a dentigerous cyst.\n\nImages: The supplied image is an unlabeled 400× hematoxylin-and-eosin photomicrograph of the resected cyst lining.\n\nQuestion: What is the most likely histopathologic diagnosis?"},{"id":"q01-d6ce42128645513e","specialty":"Neurosurgical Oncology / Neuroradiology","type":"Investigation Interpretation","month":"2026-04","claude_score":0.0,"gemini_score":0.0,"title":"Aggressive evolution of an occipital bone ABC-like lesion with dural invasion and intradural extension: a case report","image_count":2,"has_response":false,"search_text":"A woman underwent gross-total resection of an expansile lytic occipital bone lesion. The operative report from that first surgery states the dura was intact throughout the procedure, and the resected tissue showed classic benign aneurysmal bone cyst (ABC) morphology (blood-filled cystic spaces, numerous multinucleated giant cells; immunohistochemistry positive for SATB2, negative for H3.3 G34W, p63, and D2-40). Nineteen months later she developed dizziness, vomiting, and gait instability. Provided are two images from the MRI obtained at this second presentation, both from the same study: the left image is an axial contrast-enhanced T1-weighted image, and the right image is a sagittal contrast-enhanced T1-weighted image. At this time the overall recurrent process comprised multiple mixed-signal masses centered on the occipital bone, the left occipital lobe, and the left cerebellar hemisphere, with the largest component measuring roughly 8.5 x 5.0 cm and abutting both transverse sinuses. Based on the two provided images together with this history, describe the spatial relationship between the intracranial (posterior fossa/cerebellar) component and the skull-based component of the mass, and explain the most likely mechanism by which the intracranial component developed given that the dura had been intact at the first operation.\nCase: A woman underwent gross-total resection of an expansile lytic occipital bone lesion with benign aneurysmal bone cyst morphology. The operative report documented that the dura remained intact.\n\nNineteen months later, she developed dizziness, vomiting, and gait instability. MRI showed multiple mixed-signal masses centered on the occipital bone, left occipital lobe, and left cerebellar hemisphere. The largest component measured about 8.5 × 5.0 cm and abutted both transverse sinuses.\n\nImages: The left image is an axial contrast-enhanced T1-weighted MRI. The right image is a sagittal contrast-enhanced T1-weighted MRI from the same recurrence study.\n\nQuestion: What mechanism explains the imaging relationship between the intracranial and skull-based components when the dura was previously intact?"},{"id":"q01-e14daf3fc1ce2de0","specialty":"Neurology","type":"Diagnosis","month":"2026-05","claude_score":0.0,"gemini_score":0.0,"title":"Case Report: Neuronal intranuclear inclusion disease mimicking recurrent stroke in the setting of intracranial stenosis","image_count":1,"has_response":false,"search_text":"A woman in her sixties has had several stereotyped episodes of transient focal neurological deficit (facial/limb weakness, dysarthria) over about 8 years, each previously labeled a stroke, but each time she recovered nearly completely. She has no hypertension, diabetes, or dyslipidemia. Her current episode evolved gradually over roughly 10 days rather than reaching maximal deficit within minutes. Vascular imaging during this admission showed a focal >50% narrowing of one middle cerebral artery M2 segment on the side matching her deficit. The provided image shows two diffusion-weighted MRI slices from this same workup: left, the slice through the new signal abnormality corresponding to her current deficit; right, a different, lower slice obtained in the same sequence. Based on the appearance of the right-hand slice together with the long stereotyped clinical course and absence of vascular risk factors, what is the single best unifying diagnosis for her recurrent episodes, and what specific imaging feature on the right-hand slice distinguishes this from a diagnosis of recurrent arterial ischemic stroke caused by the M2 narrowing?\nCase: A woman in her 60s has had several stereotyped episodes of transient focal neurological deficit over about 8 years. The deficits included facial or limb weakness and dysarthria. Each episode was labeled a stroke, but she recovered nearly completely. She has no hypertension, diabetes, or dyslipidemia.\n\nHer current deficits progressed over about 10 days rather than reaching maximum severity within minutes. Vascular imaging showed focal narrowing greater than 50% in an M2 segment of the middle cerebral artery corresponding to her deficit.\n\nImages: The diffusion-weighted MRI slices from this workup are arranged with panel C above panel F. Panel C passes through the new signal abnormality corresponding to her current deficit. Panel F is a different, lower slice from the same sequence.\n\nQuestion: What is the single best unifying diagnosis?"},{"id":"q01-e9374fd7031570ea","specialty":"Pediatric Neurology / Clinical Genetics","type":"Mechanism","month":"2026-05","claude_score":0.0,"gemini_score":0.0,"title":"Case report: Whole-exome sequencing reveals a novel variant in a patient with epilepsy presenting with fever","image_count":1,"has_response":false,"search_text":"A 2-year-old boy has recurrent seizures, the first several fever-associated and the most recent one without any trigger. Trio genetic sequencing found a new (not inherited from either parent) single amino-acid-changing variant in a gene encoding the pore-forming subunit of a calcium-activated potassium channel that is highly expressed in the brain. The variant swaps a strongly hydrophobic residue for a hydrophilic one at a site within the channel's second transmembrane segment (part of the channel's ion-conducting core), a site that is conserved across many vertebrate species. Structural modeling showed the local hydrogen-bond network at this site is preserved after the substitution.\n\nThe provided image shows computer-predicted hydrophobicity (hydropathy) profiles plotted across the full length of the channel protein, before (left) and after (right) the amino-acid substitution; the bracketed region in both plots marks the same stretch of residues that contains the mutated site.\n\nUsing the image together with the variant's location in the ion-conducting transmembrane core, state whether this variant most likely causes a loss of channel function or a gain of channel function, and explain the biophysical mechanism that supports your answer.\nCase: A 2-year-old boy has recurrent seizures. Several occurred with fever, but the latest had no trigger.\n\nTrio sequencing found a de novo missense variant in a gene encoding the pore-forming subunit of a brain-enriched calcium-activated potassium channel. The variant replaces a strongly hydrophobic residue with a hydrophilic residue in the second transmembrane segment of the ion-conducting core. This site is conserved across many vertebrate species. Structural modeling shows that the local hydrogen-bond network remains intact after the substitution.\n\nImages: Full-length predicted hydropathy profiles are shown for the wild-type channel on the left and the mutant channel on the right. In both panels, the bracket marks residues 182–190, which contain the variant.\n\nQuestion: Is this variant most likely loss- or gain-of-function, and what biophysical mechanism explains its association with seizures?"},{"id":"q01-ef04fa2bd9cfad3e","specialty":"Endocrinology","type":"Mechanism","month":"2026-03","claude_score":0.0,"gemini_score":0.0,"title":"Unanticipated remission of primary hyperparathyroidism following cinacalcet","image_count":1,"has_response":true,"search_text":"A 68-year-old man with severe primary hyperparathyroidism (baseline serum calcium 12.1 mg/dL, intact PTH 451 pg/mL) had parathyroid surgery postponed 6 months for cardiac reasons and was instead treated with cinacalcet, titrated to and then held stable at 30 mg twice daily. At no point did he report neck pain, dysphagia, or a rapidly enlarging palpable mass. At the 6-month visit he described new paresthesias that had developed gradually over several days; labs at that visit showed serum calcium 6.8 mg/dL and intact PTH suppressed to 14 pg/mL (below the lower limit of the normal range). Cinacalcet was stopped, oral calcium was given, and symptoms resolved with normalization of calcium and PTH within a month; calcium/PTH remained normal at 1 year and about 3 years later. The provided image shows anterior-neck ultrasound of the same presumed parathyroid lesion at two time points, both in the same long-axis plane: left panel, baseline before starting cinacalcet (measured 20.8 x 13.0 mm); right panel, after 6 months of cinacalcet at the visit when the hypocalcemia was found (measured 14.3 x 9.9 mm). Using both the clinical course and the sonographic appearance in the two panels, state which mechanism is better supported for the marked shrinkage and biochemical remission: gradual cinacalcet (calcium-sensing-receptor)-mediated regression of the adenoma, or spontaneous parathyroid apoplexy (acute hemorrhagic infarction / 'auto-parathyroidectomy'). Justify your choice with the specific clinical and imaging features that favor it over the alternative.\nCase: A 68-year-old man with primary hyperparathyroidism (calcium 12.1 mg/dL; intact PTH 451 pg/mL) had surgery postponed for 6 months and took cinacalcet 30 mg twice daily. He had no neck pain, dysphagia, or rapidly enlarging mass. At 6 months, paresthesias developed gradually over several days; calcium was 6.8 mg/dL and PTH 14 pg/mL. After cinacalcet was stopped and calcium given, symptoms and laboratory values normalized within a month and remained normal at 1 and about 3 years.\n\nImages: Long-axis anterior-neck ultrasound of the same presumed parathyroid lesion before cinacalcet (left, 20.8 x 13.0 mm) and at 6 months (right, 14.3 x 9.9 mm).\n\nQuestion: Do the clinical course and ultrasound appearance better support gradual cinacalcet/CaSR-mediated regression or spontaneous parathyroid apoplexy, and which specific clinical and imaging features favor that mechanism?"},{"id":"q01-f699885cdb1b0173","specialty":"Pediatric Urology/Nephrology","type":"Treatment","month":"2026-04","claude_score":0.0,"gemini_score":0.0,"title":"Dietl Syndrome Misattributed to Gastrointestinal Disease in a Child: A Pediatric Diagnostic Pitfall","image_count":1,"has_response":false,"search_text":"The provided image shows two ultrasound views of the same kidney, obtained while investigating a child with many months of recurrent, episodic abdominal pain that had previously been treated as a gastrointestinal problem (left: view with an arrow marking the dilated renal pelvis and a second arrow marking an area of thinned renal cortex; right: view of the same kidney showing the dilated major and minor calyces forming a claw-like pattern). A subsequent nuclear medicine drainage study of this same kidney showed a drainage half-time many times longer than the upper limit of normal (normal is under 20 minutes), and this kidney was found to contribute only about one-fifth of total kidney function, far below the roughly equal split expected between two normal kidneys. Integrating the ultrasound appearance with these functional results, was reconstructive surgery to preserve this kidney (pyeloplasty) a reasonable treatment choice, and what is the physiologic reasoning?\nCase: A child had recurrent episodic abdominal pain for many months. The pain had previously been treated as a gastrointestinal problem.\n\nImages:\n- Panel A shows the right kidney with a dilated renal pelvis and an area of thinned renal cortex marked by arrows.\n- Panel B shows the same kidney with dilated major and minor calyces forming a claw-like pattern.\n\nA nuclear medicine drainage study showed a drainage half-time many times longer than the normal upper limit of 20 minutes. The kidney contributed about one-fifth of total kidney function rather than the roughly equal contribution expected from two normal kidneys.\n\nQuestion: Is pyeloplasty a reasonable treatment choice for this kidney?"},{"id":"q02-0c1ddea17ecf7b05","specialty":"Neuro-oncologic Imaging","type":"Investigation Interpretation","month":"2026-03","claude_score":0.0,"gemini_score":0.0,"title":"From a Polymorphous Low-Grade Neuroepithelial Tumor to a Glioblastoma in an Adult Patient with FGFR3-TACC3 Fusion: A Case Report and Literature Review of the Molecular Profile","image_count":1,"has_response":true,"search_text":"A patient with a known infiltrative frontal brain tumor completed radiotherapy (total dose 54.4 Gy). Four months after finishing radiotherapy, a follow-up brain MRI was obtained; no chemotherapy had yet been given. The provided image shows, from that same follow-up study and the same axial slice: left, a post-contrast T1-weighted image; right, a color-coded relative cerebral blood volume (rCBV) perfusion map. New/increased contrast enhancement was present in the region of the tumor bed. Imaging changes occurring in the first few months after chemoradiation are frequently ambiguous between treatment-related pseudoprogression and true tumor progression. Based specifically on the perfusion pattern shown in the provided image, which interpretation is better supported, and what feature of the image drives that conclusion?\nCase: A patient with a known infiltrative frontal brain tumor completed radiotherapy with a total dose of 54.4 Gy. Four months later, before any chemotherapy, follow-up MRI showed new or increased contrast enhancement in the tumor bed. This could represent treatment-related pseudoprogression or true tumor progression.\n\nImages: The provided axial images show the same slice from the follow-up MRI. The left panel is a post-contrast T1-weighted image. The right panel is a color-coded relative cerebral blood volume (rCBV) perfusion map.\n\nQuestion: Which interpretation of the new enhancement is supported by the perfusion map?"},{"id":"q02-4b02e65795deaa49","specialty":"Ophthalmology (Electrophysiology)","type":"Investigation Interpretation","month":"2026-04","claude_score":0.0,"gemini_score":0.0,"title":"CDH3 Mutation in Saudi Arabia: A Case of Hypotrichosis With Juvenile Macular Dystrophy","image_count":1,"has_response":false,"search_text":"The provided image shows six full-field electroretinography (ffERG) trace panels recorded from both eyes of the same child described in this case (right eye traces on the left of each panel pair, left eye traces on the right). The panels correspond to, in order: (1) dark-adapted rod-isolating stimulus (0.01), (2) dark-adapted mixed stimulus (3.0), (3) dark-adapted oscillatory potentials (3.0 OPs), (4) dark-adapted bright mixed stimulus (10.0), (5) light-adapted mixed cone stimulus (3.0), and (6) light-adapted 30 Hz flicker (3.0). Based only on the relative preservation versus loss of the waveforms across these dark-adapted versus light-adapted panels, state whether the rod system or the cone system is more severely affected in this child, and explain which specific panels support your conclusion.\nCase: Full-field electroretinography (ffERG) was recorded from both eyes of a child.\n\nImages: Each numbered panel shows the right eye on the left and the left eye on the right:\n1. Dark-adapted 0.01 rod-isolating stimulus\n2. Dark-adapted 3.0 mixed stimulus\n3. Dark-adapted 3.0 oscillatory potentials\n4. Dark-adapted 10.0 bright mixed stimulus\n5. Light-adapted 3.0 mixed cone stimulus\n6. Light-adapted 3.0 30 Hz flicker\n\nQuestion: Which is more severely affected, the rod or cone system, and which panel findings support that conclusion?"},{"id":"q02-60e32e37dee4b6b0","specialty":"Infectious Disease / Neuroradiology","type":"Treatment Response","month":"2026-06","claude_score":0.0,"gemini_score":0.0,"title":"Isolated Central Nervous System Tuberculosis Presenting as Progressive Encephalopathy: A Report of a Biopsy-Proven Case","image_count":2,"has_response":false,"search_text":"The first provided image is an axial contrast-enhanced T1-weighted brain MRI obtained at initial presentation, from a patient later confirmed by meningeal biopsy to have necrotizing granulomatous inflammation with positive acid-fast bacilli staining. The second provided image is a coronal FLAIR brain MRI obtained from the same patient about six months later, after starting a four-drug antituberculous regimen together with corticosteroids. Comparing the two images in the stated order (first: initial presentation; second: six-month follow-up), does the follow-up study support a favorable or unfavorable radiologic response to treatment, and which specific finding changed between the two studies?\nCase: An initial brain MRI was obtained before treatment. A subsequent meningeal biopsy showed necrotizing granulomatous inflammation with positive acid-fast bacilli staining. The patient began a four-drug antituberculous regimen and corticosteroids. Follow-up MRI was obtained about six months later.\n\nImages:\n- Image 1: Axial contrast-enhanced T1-weighted MRI at initial presentation.\n- Image 2: Coronal FLAIR MRI at six-month follow-up.\n\nQuestion: What radiologic treatment response is shown, and what specific imaging finding changed?"},{"id":"q02-9c25cf7c475b5bf1","specialty":"Gastrointestinal Oncology / Surgical Pathology","type":"Investigation Interpretation","month":"2026-05","claude_score":0.0,"gemini_score":0.0,"title":"Case Report: E-cadherin and Vimentin expression in advanced-stage pancreatic ductal adenocarcinoma tissue and circulating tumor cells: preliminary results from a pilot study","image_count":2,"has_response":false,"search_text":"The two images below show the same PDAC EUS-FNB tissue fragment immunostained for Vimentin: the 'left' image is a lower-power view of the entire fragment, and the 'right' image is a higher-power close-up of the stained region within that same fragment (brown = positive staining, blue = counterstain). In this cohort's scoring protocol, staining intensity is scored 0-3 (0=background, 1=faint, 2=moderate, 3=strong) and the percentage of positive tumor cells is scored separately on a 0-4 scale (0 for <5% of cells, 1 for 5-25%, 2 for 26-50%, 3 for 50-75%, 4 for 75-100%); the two scores are multiplied to give a weighted score, and a sample is called positive only if that weighted score exceeds 3. Using the low-power image to estimate what fraction of the overall tissue fragment contains Vimentin-positive tumor cells, and the high-power image to judge the staining intensity within that positive area, calculate the weighted score and state whether this sample would be classified as Vimentin-positive or negative.\nCase: A PDAC EUS-FNB tissue fragment was immunostained for Vimentin. Brown indicates positive staining, and blue is the counterstain.\n\nImages: The left image is a lower-power view of the entire fragment; use it to estimate the percentage of Vimentin-positive tumor cells. The right image is a higher-power view of the stained region in the same fragment; use it to assess staining intensity.\n\nScore intensity from 0 to 3: 0 for background, 1 for faint, 2 for moderate, and 3 for strong staining. Score the percentage of positive tumor cells from 0 to 4: 0 for <5%, 1 for 5–25%, 2 for 26–50%, 3 for 50–75%, and 4 for 75–100%. Multiply the two scores. A weighted score greater than 3 is positive.\n\nQuestion: What weighted score and Vimentin classification result from the two images?"},{"id":"q02-e156c0046851700a","specialty":"Vascular Surgery","type":"Complication","month":"2026-06","claude_score":0.0,"gemini_score":0.0,"title":"Staged Surgical and Endovascular Management of Parkes–Weber Syndrome to Preserve Limb Function: A Case Report","image_count":1,"has_response":false,"search_text":"During the first-stage operation for this arteriovenous malformation, an intraoperative aneurysm rupture caused active bleeding, which was controlled by deploying covered stent grafts to seal the dilated superficial femoral and popliteal arteries; adequate arterial hemostasis was achieved. On follow-up CT angiography obtained after this surgery, small vessels were still seen supplying blood into the residual hematoma cavity, shown in the provided 3-D vascular reconstruction (the green mass is the residual hematoma; the pale tubular structure running through it is the stented arterial segment; the fine reddish branches are the small residual feeding vessels). Given that the major superficial femoral and popliteal arterial trunks were already excluded by the stent grafts, (1) what is the most likely anatomic origin of the small persisting feeder vessels visible around the hematoma in the image, and (2) why does this origin make them resistant to standard proximal arterial control methods such as tourniquets or arterial ligation?\nCase: During the first-stage operation for an arteriovenous malformation, an intraoperative aneurysm rupture caused active bleeding. Covered stent grafts sealed the dilated superficial femoral and popliteal arteries, achieving adequate arterial hemostasis. Follow-up CT angiography showed small vessels continuing to supply the residual hematoma cavity after the major arterial trunks had been excluded.\n\nImages: In the 3-D vascular reconstruction, the green mass is the residual hematoma. The pale tubular structure crossing it is the stented arterial segment. Fine red branches are the persistent feeder vessels.\n\nQuestion: What is the most likely anatomic origin of the persistent feeder vessels?"},{"id":"q02-fae0fd6e965a8cff","specialty":"Dermatology","type":"Treatment Response","month":"2026-03","claude_score":0.0,"gemini_score":0.0,"title":"Acquired perforating dermatosis associated with uremic pruritus treated with dupilumab monotherapy: A case report","image_count":1,"has_response":true,"search_text":"This patient's biopsy-confirmed reactive perforating dermatosis, occurring in the setting of uremic pruritus from chronic kidney disease, had failed 7 months of oral antihistamines, potent topical corticosteroids, and emollients; narrowband UVB was declined for logistical reasons, and systemic corticosteroids were avoided because of her uncontrolled diabetes and diabetic nephropathy. She was then started on a biologic that blocks a receptor subunit shared by two type-2 cytokines, given as a loading dose followed by an injection every two weeks. Over follow-up, her itch intensity on a 0-10 numeric rating scale fell from 10 to 0. The provided image shows the same posterior lower-limb region at two time points: left, before this biologic was started (active disease); right, 10 months after starting it. Aside from the disappearance of the papules, nodules, and excoriations, what residual skin change is still visible in the right-hand image, and what does the persistence of this specific finding (rather than complete return to normal-appearing skin) indicate about the depth of the tissue injury that occurred during active disease?\nCase: A patient with biopsy-confirmed reactive perforating dermatosis associated with uremic pruritus from chronic kidney disease began biologic treatment after 7 months of oral antihistamines, potent topical corticosteroids, and emollients had failed.\n\nImages: Both panels show the same posterior lower-limb region. The left panel shows active disease before the biologic. The right panel shows the region 10 months later, after the papules, nodules, and excoriations had disappeared.\n\nQuestion: What does the persistent skin change in the right panel indicate about the depth of tissue injury during active disease?"},{"id":"q01-a9871ac39b119d83","specialty":"Breast Surgical Oncology / Breast Pathology","type":"Mechanism","month":"2026-03","claude_score":0.0,"gemini_score":0.0,"title":"Early Local Recurrence as Invasive Micropapillary Carcinoma after Skin-Sparing Mastectomy with Immediate Deep Inferior Epigastric Perforator Flap Reconstruction for Ductal Carcinoma &lt;i&gt;in situ&lt;/i&gt;","image_count":0,"has_response":true,"search_text":"A woman in her forties had extensive ductal carcinoma in situ (DCIS, ~12 cm span) of one breast, diagnosed after a core needle biopsy (CNB) that disrupted a duct/cyst wall and produced a hematoma-like change at the biopsy site. She underwent skin-sparing mastectomy with immediate autologous flap reconstruction. The mastectomy specimen showed DCIS only (papillary/cribriform architecture, no invasive component identified anywhere) with clear margins and no nodal disease; no adjuvant chemotherapy, endocrine therapy, or radiotherapy was given. Ten months later, a new mass (roughly 23-25 mm) developed in the reconstructed breast at the same quadrant as the original tumor. Core biopsy and subsequent resection showed frankly invasive micropapillary carcinoma (ER-positive, PgR-positive, HER2-negative, Ki-67 ~25%). On retrospective re-review of the original mastectomy specimen, tumor cells with micropapillary architecture were found directly adjacent to the disrupted ductal wall at the original biopsy site, but still no definite invasive focus could be identified even on this re-review. Three candidate explanations are anatomically residual glandular tissue left behind at mastectomy, tumor cell displacement/implantation along the CNB needle tract, and an occult invasive focus already present at the time of the original surgery that went undetected. Using the location, timing, and histologic evidence given, which of these is the single most likely explanation for this recurrence, and what specific piece of evidence argues against each of the other two?\nCase: A woman in her forties had extensive DCIS (~12 cm) diagnosed by core needle biopsy, which disrupted a duct/cyst wall and caused a hematoma-like change. She underwent skin-sparing mastectomy with immediate autologous flap reconstruction. Pathology showed papillary/cribriform DCIS only, with no invasion, clear margins, and no nodal disease; she received no adjuvant therapy.\n\nTen months later, a 23-25 mm mass appeared in the same quadrant of the reconstructed breast. Biopsy and resection showed invasive micropapillary carcinoma (ER-positive, PgR-positive, HER2-negative, Ki-67 ~25%). Re-review of the original specimen found micropapillary-patterned tumor cells beside the biopsy-disrupted ductal wall, but still no definite invasive focus.\n\nQuestion: Which single explanation is most likely—residual glandular tissue after mastectomy, implantation along the biopsy tract, or an occult invasive focus missed at the original surgery—and what specific evidence argues against each alternative?"},{"id":"q02-3ee94a35b08228b5","specialty":"Urology","type":"Mechanism","month":"2026-05","claude_score":0.0,"gemini_score":0.0,"title":"Inflammation With a Twist: A Rare Urologic Case Report","image_count":0,"has_response":false,"search_text":"In cases where an adult testis is found to be both infarcted and secondarily abscessed, two competing mechanisms are debated: (A) the spermatic cord twists first, producing ischemia and tissue death that is then secondarily colonized by bacteria; versus (B) a severe primary epididymo-orchitis raises pressure within the non-distensible tunica albuginea enough to compress venous outflow and secondarily infarct the testis. At surgical exploration in this case, the testicle was found densely adherent to the surrounding scrotal wall and adjacent soft tissue, and was markedly discolored with a deep green hue. Based on these intraoperative findings alone, which mechanism is better supported, and what specific aspect of the gross findings supports that choice?\nCase: An adult testis was infarcted and secondarily abscessed. Two mechanisms are proposed:\n\n- Mechanism A: The spermatic cord twists first, causing ischemia and tissue death, followed by bacterial colonization.\n- Mechanism B: Severe primary epididymo-orchitis raises pressure within the non-distensible tunica albuginea, compressing venous outflow and causing secondary testicular infarction.\n\nDuring surgical exploration, the testis was densely adherent to the scrotal wall and adjacent soft tissue. It was markedly discolored with a deep green hue.\n\nQuestion: Which mechanism best explains the gross operative findings?"},{"id":"q02-4e14c4882fe6a340","specialty":"Neuro-ophthalmology","type":"Diagnosis","month":"2026-04","claude_score":0.0,"gemini_score":0.0,"title":"Bilateral Optic Neuritis in Paediatric Acute Disseminated Encephalomyelitis: A Case Report of Clinical Challenges and Management Outcomes","image_count":0,"has_response":false,"search_text":"A child had acute bilateral vision loss of moderate severity (visual acuity reduced from normal but not to light perception), with normal pupillary light reflex, normal colour vision, and orthophoria. On dilated fundoscopic examination, both optic discs appeared completely normal with no swelling, yet brain and orbital MRI demonstrated inflammatory demyelinating lesions consistent with the patient's visual symptoms. Where along the visual pathway is the inflammatory lesion most likely localized, and why does this specific localization explain the normal fundoscopic disc appearance despite the significant reduction in visual acuity?\nCase: A child developed acute, moderately severe bilateral vision loss. Visual acuity had been normal and did not fall to light perception. Pupillary light reflexes and colour vision were normal, with orthophoria. Dilated fundoscopy showed completely normal optic discs without swelling. Brain and orbital MRI showed inflammatory demyelinating lesions consistent with the visual symptoms.\n\nQuestion: Where along the visual pathway is the inflammatory lesion?"},{"id":"q02-7cff4581475a27a4","specialty":"Colorectal Surgery","type":"Diagnosis","month":"2026-04","claude_score":0.0,"gemini_score":0.0,"title":"Complex transsphincteric ano-rectal fistula with circumferential perirectal abscess and periprostatic extension: the added value of contrast-enhanced pelvic MRI","image_count":0,"has_response":false,"search_text":"A man presents with persistent anal discharge without fever and normal inflammatory markers (WBC 6.66 K/µL; neutrophils 52.5%). Pelvic MRI shows a fistula tract crossing the external anal sphincter with its internal opening near the dentate line, plus a separate, distinct tract/collection that extends cranially along one side of the pelvis up to the region just inferior to the prostate. Using the levator ani muscle (levator plate) as the anatomic reference that divides the pelvis into an upper (pelvic) and lower (ischioanal/perineal) compartment, is this cranial extension located above or below the level of the levator plate, and what is the main practical consequence of this location for surgical/sepsis-control planning?\nCase: A man has persistent anal discharge without fever. His inflammatory markers are normal (WBC 6.66 K/µL; neutrophils 52.5%).\n\nPelvic MRI shows a fistula crossing the external anal sphincter, with an internal opening near the dentate line. A separate tract or collection extends cranially along one side of the pelvis to just below the prostate. The levator plate divides the upper pelvic compartment from the lower ischioanal and perineal compartment.\n\nQuestion: Is the cranial extension above or below the levator plate?"},{"id":"q02-96f20934cd7217e0","specialty":"Clinical Microbiology / Infectious Disease","type":"Investigation Interpretation","month":"2026-04","claude_score":0.0,"gemini_score":0.0,"title":"Oral amoxicillin-clavulanate: an alternative treatment to refractory\n                    <i>Nocardia</i>\n                    keratitis—a case report","image_count":0,"has_response":false,"search_text":"Corneal cultures of the same Nocardia isolate were tested for antimicrobial susceptibility twice: once at initial presentation and again 2 months later. Amikacin, ciprofloxacin, and clarithromycin remained resistant at both time points with essentially unchanged MICs. Comparing the full susceptibility panel between the two time points, name the antibiotic(s) whose susceptibility category improved (moved to a more susceptible category) between the initial and 2-month cultures, and state the direction of change for each.\nCase: The same Nocardia isolate from corneal cultures underwent antimicrobial susceptibility testing at presentation and 2 months later. Amikacin, ciprofloxacin, and clarithromycin remained resistant, with essentially unchanged MICs. Compare the full susceptibility panels at the two time points.\n\nQuestion: Which antibiotics moved to a more susceptible category, and what was each category change?"},{"id":"q02-a7779b9fd423dffe","specialty":"General/Colorectal Surgery (Abdominal Wall & Hernia)","type":"Complication","month":"2026-07","claude_score":0.0,"gemini_score":0.0,"title":"Lateral Approach Circumstomal Open Retrorectus Mesh Repair with Transversus Abdominis Release and Three-Point Stomal Pexy for an Acute-on-Chronic Complex Parastomal Hernia Causing High-Grade Gastric Outlet Obstruction: A Case Report","image_count":0,"has_response":false,"search_text":"This patient underwent emergency open repair of a complex abdominal wall hernia containing her stomach. Postoperatively her subcutaneous drain output fell below 30 mL/24 h by day 6, she tolerated escalating oral diet, her stoma showed no ischaemia, and she had no wound or mesh complications. Despite this otherwise uneventful surgical recovery, an unrelated event in the first week after surgery delayed her eventual discharge by about two weeks. She has long-standing rheumatoid arthritis managed with prednisolone, methotrexate, and hydroxychloroquine. Identify the complication that occurred, explain the mechanism most likely responsible for it in this patient, and explain specifically why this particular complication (rather than anything related to the hernia repair) was what delayed her discharge.\nCase: A patient underwent emergency open repair of a complex abdominal wall hernia containing her stomach. By postoperative day 6, subcutaneous drain output was below 30 mL/24 h. She tolerated an advancing oral diet. Her stoma showed no ischaemia, and she had no wound or mesh complications.\n\nAn unrelated event during the first postoperative week delayed discharge by about two weeks. She had long-standing rheumatoid arthritis treated with prednisolone, methotrexate, and hydroxychloroquine.\n\nQuestion: What complication caused the delayed discharge?"},{"id":"q02-a86f703438e52b62","specialty":"Oral and Maxillofacial Surgery / Implant Dentistry","type":"Treatment","month":"2026-06","claude_score":0.0,"gemini_score":0.0,"title":"The “Zero-Gap Protocol” for the Rehabilitation of Severe Jaw Atrophy via the Digital Workflow: A Preliminary Clinical Study","image_count":0,"has_response":false,"search_text":"A patient with Type II Von Willebrand disease (a bleeding disorder), plus chronic obstructive pulmonary disease and dilated cardiomyopathy, needed fixed rehabilitation of a one-sided area of severe upper jaw bone loss that could not support a standard bone-anchored implant without extensive bone-grafting/reconstructive surgery. Two specific management decisions in this patient were made largely to address the bleeding disorder: (1) the choice of an implant technique that avoided bone grafting, and (2) the choice of anesthesia and monitoring setting for the operation. State what was chosen in each case and explain how each choice specifically reduces bleeding-related risk in a patient with a coagulation disorder.\nCase: A patient with type II von Willebrand disease, chronic obstructive pulmonary disease, and dilated cardiomyopathy required fixed rehabilitation of severe unilateral maxillary bone loss. Conventional bone-anchored implantation would require extensive bone grafting or reconstructive surgery. To limit bleeding risk, clinicians chose a graft-free implant technique and a specific anesthesia and monitoring setting.\n\nQuestion: What implant and anesthesia-monitoring strategies were used to reduce bleeding risk?"},{"id":"q02-bebe3ece057ad906","specialty":"Surgical Oncology","type":"Mechanism","month":"2026-05","claude_score":0.0,"gemini_score":0.0,"title":"Skeletal Muscle Metastases from Colorectal Adenocarcinoma: A Rare Case Report with Literature Review","image_count":0,"has_response":false,"search_text":"This patient's primary right colon adenocarcinoma was staged pT3N1a, with 1 of 11 lymph nodes involved and both lymphatic and vascular invasion identified on histology of the resected specimen. When the thigh mass was later discovered, contrast-enhanced CT of the chest, abdomen, and pelvis showed no pulmonary, hepatic, or other visceral or nodal metastases at that time, and whole-body PET-CT subsequently confirmed the thigh lesion as the only site of abnormal metabolic uptake outside the primary tumor bed. Given this combination of findings — lymphovascular invasion and nodal disease in the primary tumor, together with a single intramuscular deposit and no visceral spread — which route of metastatic dissemination to the muscle is more strongly supported, lymphatic or hematogenous, and what is the reasoning?\nCase: A primary right colon adenocarcinoma was staged pT3N1a after resection. Histology showed lymphatic and vascular invasion, with 1 of 11 lymph nodes involved.\n\nA thigh mass was found later. Contrast-enhanced CT of the chest, abdomen, and pelvis showed no pulmonary, hepatic, other visceral, or nodal metastases. Whole-body PET-CT then showed that the thigh lesion was the only site of abnormal metabolic uptake outside the primary tumor bed.\n\nQuestion: Which metastatic route to the thigh muscle is better supported by these findings: lymphatic or hematogenous?"},{"id":"q03-0b9e073f8f1de29c","specialty":"Medical Oncology / Hepatobiliary Oncology","type":"Treatment","month":"2026-05","claude_score":0.0,"gemini_score":0.0,"title":"A case of synchronous double primary combined hepatocellular-cholangiocarcinoma complicated with gallbladder adenocarcinoma: a rare case report","image_count":0,"has_response":false,"search_text":"A patient's hepatic tumor was confirmed by immunohistochemistry to be mismatch-repair proficient: staining for MSH2, MSH6, MLH1, and PMS2 was all positive/intact, indicating a microsatellite-stable (MSS) tumor. Despite MSS status generally predicting poor response to immune checkpoint inhibitors, the postoperative adjuvant regimen still combined a PD-1 inhibitor with oxaliplatin and capecitabine. Identify the two specific tumor characteristics (other than microsatellite status) documented in this case that were used to justify adding immunotherapy to chemotherapy despite the unfavorable MSS profile, and briefly explain the biological rationale for each.\nCase: Immunohistochemistry of a hepatic tumor showed intact staining for MSH2, MSH6, MLH1, and PMS2. This confirmed mismatch-repair proficiency and microsatellite-stable (MSS) status. Although MSS generally predicts poor response to immune checkpoint inhibitors, postoperative adjuvant treatment combined a PD-1 inhibitor with oxaliplatin and capecitabine.\n\nQuestion: What two tumor characteristics, with their biological rationales, justified adding immunotherapy despite MSS status?"},{"id":"q03-21b4a16ce0e1a25a","specialty":"Neurosurgery (Skull Base/Vascular Neurosurgery)","type":"Investigation Interpretation","month":"2026-06","claude_score":0.0,"gemini_score":0.0,"title":"How I do it: Endoscopic microvascular decompression with vertebral artery transposition for trigeminal neuralgia caused by vertebrobasilar dolichoectasia","image_count":0,"has_response":false,"search_text":"Before this endoscopic vertebral-artery transposition operation for trigeminal neuralgia, multimodal MRI image fusion was used to map the compressing vertebral artery loop relative to the trigeminal nerve. Beyond simply confirming which vessel is compressing the nerve, name one other specific vascular structure whose course/origin needed to be assessed relative to the planned transposition corridor, and explain why an ectatic vertebral artery makes this particular assessment especially important.\nCase: Endoscopic vertebral-artery transposition is planned for trigeminal neuralgia. Multimodal MRI fusion maps the compressing vertebral-artery loop relative to the trigeminal nerve. The course and origin of another vascular structure must be assessed relative to the planned transposition corridor. The vertebral artery is ectatic.\n\nQuestion: What additional vascular safety concern must be assessed before transposition?"},{"id":"q03-5293e3e24faeb71d","specialty":"Thoracic Surgery / Critical Care","type":"Complication","month":"2026-05","claude_score":0.0,"gemini_score":0.0,"title":"Sub-threshold hypoalbuminemia, anemia, and occult infection trigger post-lobectomy bronchopleural fistula: a case report","image_count":0,"has_response":false,"search_text":"Untreated bronchopleural fistula (BPF) is understood to progress along three possible pathways: (1) continuous soiling of the pleural space causing empyema, with bacterial translocation leading to sepsis/septic shock; (2) aspiration of infected pleural contents into the contralateral lung causing aspiration pneumonia and respiratory failure; or (3) erosion of adjacent major thoracic vessels by the infective/inflammatory process causing exsanguinating hemorrhage. A post-lobectomy patient with a suspected but bronchoscopically unconfirmed BPF (he declined bronchoscopy and chest tube placement) presented with hemoptysis whose frequency rose from twice-daily 5-mL episodes to about 10 episodes/day over 10 days, while the volume per episode stayed small and unchanged throughout; hemoglobin fell from 142 to 79 g/L; and admission white-cell count (11.14x10^9/L) and procalcitonin (1.91 ng/mL) were both above normal, though he denied fever. Imaging at the time showed a moderate hydropneumothorax with partial lung collapse. He was treated only with antibiotics and hemostatic agents. Given this specific trajectory, which one of the three cascades represented his most immediate life-threatening risk if the fistula had persisted untreated, and why do the escalating hemoptysis frequency (rather than escalating volume) and the elevated inflammatory markers point toward that pathway rather than the other two?\nCase: Untreated bronchopleural fistula (BPF) can progress through three pathways:\n\n1. Pleural-space contamination may cause empyema, bacterial translocation, sepsis, and septic shock.\n2. Aspiration of infected pleural contents into the contralateral lung may cause aspiration pneumonia and respiratory failure.\n3. Infection and inflammation may erode major thoracic vessels, causing exsanguinating hemorrhage.\n\nA post-lobectomy patient had a suspected BPF. He declined bronchoscopy and chest-tube placement, so the BPF remained bronchoscopically unconfirmed.\n\nOver 10 days, his hemoptysis increased from two 5-mL episodes daily to about 10 episodes daily. The volume per episode remained small and unchanged. His hemoglobin fell from 142 to 79 g/L.\n\nHis admission white-cell count was 11.14 × 10^9/L, and his procalcitonin was 1.91 ng/mL. Both were elevated, although he denied fever. Imaging showed a moderate hydropneumothorax with partial lung collapse. He received only antibiotics and hemostatic agents.\n\nQuestion: Which untreated BPF pathway posed the most immediate life-threatening risk?"},{"id":"q03-647c75e38243444a","specialty":"Hematopathology / Medical Oncology","type":"Diagnosis","month":"2026-06","claude_score":0.0,"gemini_score":0.0,"title":"Rhabdomyosarcoma Confined to the Bone Marrow: A Case Report and Literature Review","image_count":0,"has_response":false,"search_text":"A previously healthy woman in her mid-30s presented with fatigue, easy bruising, severe anemia, severe thrombocytopenia, and laboratory evidence of disseminated intravascular coagulopathy, a picture that was initially thought to represent an acute hematological malignancy such as leukemia. A bone marrow biopsy was performed instead of assuming leukemia. Comprehensive whole-body imaging found no soft-tissue mass anywhere. The marrow biopsy specimen was subjected to immunohistochemistry and molecular testing rather than being read as a routine leukemia panel alone. State the most likely final diagnosis, and identify the two categories of ancillary testing (immunohistochemical and molecular) that were essential to reach it rather than misdiagnosing this as a hematological malignancy.\nCase: A previously healthy woman in her mid-30s presented with fatigue and easy bruising. She had severe anemia, severe thrombocytopenia, and laboratory evidence of disseminated intravascular coagulopathy. An acute hematological malignancy, such as leukemia, was initially suspected. A bone marrow biopsy was performed. Comprehensive whole-body imaging showed no soft-tissue mass. The marrow specimen underwent immunohistochemical and molecular testing rather than only a routine leukemia panel.\n\nQuestion: What is the most likely diagnosis?"},{"id":"q03-6da451d039376c1f","specialty":"Geriatric Neurosurgery","type":"Complication","month":"2026-05","claude_score":0.0,"gemini_score":0.0,"title":"Reconsidering Surgical Intervention for Infection After Cranioplasty in Older Adults: A Case Report","image_count":0,"has_response":false,"search_text":"An older patient with cognitive impairment underwent debridement of an infected cranial implant and free-flap reconstruction of a large scalp defect. Antibiotics were stopped after one week based on the absence of systemic inflammatory signs and no radiologic evidence of intracranial infection. At one month, the free flap was viable with no signs of recurrent infection. Rehabilitation was started one week after surgery, but the patient nonetheless developed disuse syndrome and was transferred to another facility with a modified Rankin Scale score of 4; at 14 months she remained wheelchair-dependent at home, still with no recurrence of wound infection. Identify the specific postoperative complication reported in the case that explains why the functional outcome remained poor despite surgical and infection-control success, and describe the causal sequence linking that complication to the eventual disability.\nCase: An older woman with cognitive impairment underwent debridement of an infected cranial implant and free-flap reconstruction of a large scalp defect. Antibiotics were stopped after one week because she had no systemic inflammatory signs or radiologic evidence of intracranial infection.\n\nAt one month, the flap was viable without recurrent infection. Rehabilitation began one week after surgery, but she developed disuse syndrome and was transferred with a modified Rankin Scale score of 4. At 14 months, she remained wheelchair-dependent at home without recurrent wound infection.\n\nQuestion: Which postoperative complication best explains the poor functional outcome?"},{"id":"q03-960162ef69d93d0a","specialty":"Restorative/Adhesive Dentistry (Esthetic Dentistry)","type":"Treatment","month":"2026-05","claude_score":0.0,"gemini_score":0.0,"title":"Adhesive Restorative Procedures for Anterior Esthetic Rehabilitation: A Case Series","image_count":0,"has_response":false,"search_text":"A young adult had an incisal fracture of one upper front tooth together with a mild midline shift between the two upper central incisors (uneven left-right proportions instead of a straight midline). Orthodontic correction and an indirect, lab-fabricated restoration were both ruled out for practical reasons, and the clinician chose to correct the discrepancy using direct chairside composite alone. Chairside measurements of (1) the width-to-length ratio of each central incisor and (2) the mesiodistal size discrepancy between them were used to decide, tooth by tooth, how much of the midline correction should be achieved by building up composite (additive) versus by removing enamel (subtractive) on each incisor. Based on this measurement-driven plan, which of the two central incisors ended up receiving actual enamel reduction/preparation, and which received a purely additive, no-preparation correction? State the specific preparation performed on the tooth that was reduced.\nCase: A young adult had an incisal fracture of one upper central incisor and a mild midline shift between the central incisors, causing unequal left-right proportions. Orthodontic correction and an indirect laboratory-fabricated restoration were ruled out for practical reasons. The clinician chose direct chairside composite alone.\n\nThe width-to-length ratio of each incisor and the mesiodistal size discrepancy between them were measured. These measurements guided the additive composite buildup and subtractive enamel removal planned for each tooth.\n\nQuestion: How was each central incisor treated, including any enamel preparation and additive composite correction?"},{"id":"q03-cc54279ce24e2425","specialty":"General Surgery / Gastrointestinal Pathology","type":"Diagnosis","month":"2026-05","claude_score":0.0,"gemini_score":0.0,"title":"Necrotic Ileal Diverticulum With Features Mimicking Meckel’s Diverticulum: A Diagnostic Challenge","image_count":0,"has_response":false,"search_text":"An ileal diverticulum was found approximately 60 cm proximal to the ileocecal valve, arising as a solitary lesion from the antimesenteric border, roughly 10 cm long with a relatively narrow 2 cm base. There was no fibrous band, no communication with the umbilicus, and no independent vascular pedicle or persistent vitelline-type artery supplying it. On histology, transmural ischemic necrosis and acute inflammation were present; smooth muscle fibers were identified, but the wall did not show the complete, well-organized full-thickness architecture expected of a true congenital diverticulum, and extensive tissue sampling found no ectopic gastric or pancreatic tissue. Weighing the anatomic (gross) features against the vascular and histologic findings, is the overall evidence more consistent with a true congenital (Meckel's-type) diverticulum, an acquired pseudodiverticulum, or does it remain indeterminate? Justify your answer using at least two independent categories of evidence.\nCase: A solitary ileal diverticulum arose from the antimesenteric border about 60 cm proximal to the ileocecal valve. It was about 10 cm long and had a relatively narrow 2 cm base.\n\nThere was no fibrous band, umbilical communication, independent vascular pedicle, or persistent vitelline-type artery.\n\nHistology showed transmural ischemic necrosis and acute inflammation. Smooth muscle fibers were present, but the wall lacked the complete, well-organized full-thickness architecture expected in a true congenital diverticulum. Extensive sampling found no ectopic gastric or pancreatic tissue.\n\nThe possible classifications are a true congenital Meckel-type diverticulum, an acquired pseudodiverticulum, or indeterminate.\n\nQuestion: Which classification is best supported by at least two independent categories of evidence?"},{"id":"q03-d43f921e834d0000","specialty":"Anesthesiology","type":"Investigation Interpretation","month":"2026-04","claude_score":0.0,"gemini_score":0.0,"title":"Saturation Gap During Anesthesia in Glucose-6-Phosphate Dehydrogenase Deficiency and Methemoglobinemia: A Case Report and Review of Perioperative Management","image_count":0,"has_response":false,"search_text":"On arrival in the operating room, before any intervention, this patient's pulse oximeter read 45% on room air while the arterial blood gas obtained shortly afterward (after supplemental oxygen was started) showed a PaO2 above 400 mmHg. Once general anesthesia was established with an inspired oxygen fraction of 0.6, the SpO2 stabilized between 82% and 85% for the remainder of the two-hour procedure, with serial arterial blood gases continuing to show PaO2 above 300 mmHg and no metabolic acidosis or elevated lactate. Methemoglobinemia classically produces a pulse-oximetry plateau near 85% regardless of the true oxygen saturation, because methemoglobin absorbs light similarly at the two wavelengths used by conventional oximeters. Reconcile why the initial 45% reading fell well below this expected plateau while the later intraoperative readings matched it, and state what this pattern implies for how any future pulse-oximetry reading below the typical ~85% plateau should be interpreted in this patient.\nCase: Before any intervention in the operating room, the pulse oximeter read 45% on room air. Shortly after supplemental oxygen was started, arterial blood gas analysis showed a PaO2 above 400 mmHg.\n\nAfter general anesthesia was established with an inspired oxygen fraction of 0.6, SpO2 remained between 82% and 85% throughout the two-hour procedure. Serial arterial blood gases showed PaO2 above 300 mmHg, without metabolic acidosis or elevated lactate.\n\nMethemoglobinemia typically causes conventional pulse-oximetry readings to plateau near 85%, regardless of true oxygen saturation. This occurs because methemoglobin absorbs light similarly at the two wavelengths used by the oximeter.\n\nQuestion: How should the initial 45% reading and any future value below the usual plateau be interpreted?"},{"id":"q03-d89bdb28347ec18a","specialty":"Neurosurgery / Skull Base Surgery","type":"Treatment","month":"2026-04","claude_score":0.0,"gemini_score":0.0,"title":"Accessory Nerve Schwannomas Presenting with Hypoglossal Nerve Palsy: A Narrative Review with an Illustrative Case","image_count":0,"has_response":false,"search_text":"A jugular-foramen tumor arising from the accessory nerve extends laterally through the extracranial hypoglossal canal down to the level of the first cervical vertebra, compressing (but not invading) the hypoglossal nerve, with additional involvement of adjacent lower cranial nerve territories. Surgical resection is planned. Given that the accessory nerve is the tumor's nerve of origin, what extent-of-resection strategy is most appropriate for the intracranial/nerve-of-origin portion of this tumor, and what key trade-off does this strategy balance?\nCase: A jugular-foramen tumor arises from the accessory nerve. It extends laterally through the extracranial hypoglossal canal to the level of C1. It compresses, but does not invade, the hypoglossal nerve. Adjacent lower cranial nerve territories are also involved. Surgical resection is planned.\n\nQuestion: What extent-of-resection approach for the intracranial portion best balances tumor removal with preservation of the nerve of origin?"},{"id":"q03-fd096e353120b1e0","specialty":"Clinical Pharmacology/Toxicology","type":"Treatment Response","month":"2026-07","claude_score":0.0,"gemini_score":0.0,"title":"Plasma Exchange in the Setting of Acute Ibuprofen Poisoning: A Case and Review of the Literature","image_count":0,"has_response":false,"search_text":"Ibuprofen reaches peak plasma concentration within about 2 hours of ingestion and has an elimination half-life of roughly 1-3 hours, so the drug is expected to be almost fully cleared spontaneously within about 5-15 hours (five half-lives) after ingestion. In one published case, plasma exchange was not started until the serum ibuprofen level had already fallen by about 50% spontaneously in the roughly 5 hours between admission and the procedure; that single exchange achieved only about a 30% reduction in serum ibuprofen level. In the case described here, plasma exchange (removing the same one plasma volume) was performed approximately 16 hours after presentation to the emergency department (itself within about 6 hours of ingestion), and produced roughly a 68% reduction in serum ibuprofen level, close to the calculated theoretical maximum single-exchange removal of 65-70% for a drug with this protein binding and volume of distribution. Explain the single most likely reason the fractional reduction in serum ibuprofen achieved by this exchange was so much higher than in the case where exchange was delayed relative to ingestion, even though both used a similar one-plasma-volume exchange.\nCase: Ibuprofen reaches peak plasma concentration within about 2 hours of ingestion. Its elimination half-life is approximately 1–3 hours, so it is expected to be almost fully cleared spontaneously within about 5–15 hours.\n\nIn a comparison case, plasma exchange began about 5 hours after admission. The serum ibuprofen level had already fallen spontaneously by about 50%. A one-plasma-volume exchange then reduced the level by about 30%.\n\nIn the current case, the patient presented within about 6 hours of ingestion. A one-plasma-volume exchange was performed approximately 16 hours after presentation and reduced the serum ibuprofen level by about 68%. This was close to the calculated theoretical maximum of 65–70% for a drug with this protein binding and volume of distribution.\n\nQuestion: What most likely explains the difference in fractional ibuprofen reduction between the two exchanges?"},{"id":"q03-2d0960fbec9bacf1","specialty":"Neuro-oncology","type":"Prognosis","month":"2026-05","claude_score":1.0,"gemini_score":0.0,"title":"Immunotherapy-Induced Glutamic Acid Decarboxylase 65 Cerebellitis","image_count":0,"has_response":false,"search_text":"Most reported neurologic immune-related adverse events from anti-PD-1 therapy occur with a median latency of about 40-60 days after starting treatment and typically present with fever, altered mental status, or memory changes. A patient instead developed her first neurologic symptoms after roughly 15 months of continuous PD-1 inhibitor maintenance therapy, with gait ataxia as the dominant complaint, and was found to have a markedly elevated neural autoantibody (anti-GAD65) in both serum and CSF. She was treated with a short course of high-dose intravenous corticosteroid followed by intravenous immunoglobulin (IVIG). Considering (a) the reported relationship between neural autoantibody positivity and prognosis in checkpoint-inhibitor-associated encephalitis, and (b) this patient's atypical presentation, what short-term treatment trajectory would you predict, and does it support a favorable or unfavorable prognosis?\nCase: Most neurologic immune-related adverse events from anti-PD-1 therapy begin 40–60 days after treatment starts. They typically cause fever, altered mental status, or memory changes.\n\nThis patient developed her first neurologic symptoms after about 15 months of continuous PD-1 inhibitor maintenance therapy. Gait ataxia was the dominant symptom. Anti-GAD65 autoantibodies were markedly elevated in both serum and cerebrospinal fluid.\n\nShe received a short course of high-dose intravenous corticosteroids followed by intravenous immunoglobulin. Neural autoantibody positivity has a reported association with prognosis in checkpoint-inhibitor-associated encephalitis.\n\nQuestion: What short-term clinical course and prognosis are expected after treatment?"},{"id":"q01-00a2026ad169f26a","specialty":"Orthopedic Surgery - Upper Extremity/Elbow Reconstruction","type":"Complication","month":"2026-06","claude_score":2.0,"gemini_score":0.0,"title":"Ulnar reconstruction in a multiply revised total elbow arthroplasty with temporary radial implantation of the ulnar component: a case report","image_count":1,"has_response":false,"search_text":"An elderly man with a multiply revised, linked total elbow arthroplasty underwent a two-stage salvage reconstruction. In stage 1, a humeral allograft-prosthesis composite (APC) was secured with cerclage wires, and because the proximal ulna was too deficient to hold an implant stem, the ulnar component's stem was instead seated temporarily into the medullary canal of the radius, forming a linked articulation; the native ulna (reinforced with an intramedullary rod, allograft struts, cancellous graft, and cerclage wires) was left to biologically heal separately. The provided image shows the same lateral elbow radiograph at two time points: left, shortly after the stage-1 reconstruction; right, roughly three years later, before any further surgery. Across this interval, repeated infection workups (blood counts, inflammatory markers, and joint aspiration cultures) were all negative. Based on the changes visible between the two images and the negative infection workup, which specific reconstructed component has failed, what is the underlying mechanism, and what radiographic evidence in the image supports this over an infectious cause?\nCase: An elderly man underwent two-stage salvage reconstruction after multiple revisions of a linked total elbow arthroplasty.\n\nDuring stage 1, a humeral allograft-prosthesis composite was secured with cerclage wires. The deficient proximal ulna could not hold an implant stem. The ulnar component's stem was therefore placed temporarily in the radial medullary canal to form the linked articulation. The native ulna was reconstructed separately with an intramedullary rod, allograft struts, cancellous graft, and cerclage wires for biological healing.\n\nSerial blood counts, inflammatory markers, and joint aspiration cultures remained negative.\n\nImages: Both panels are lateral radiographs of the same left elbow. The left panel was obtained shortly after stage 1. The right panel was obtained about three years later, before further surgery.\n\nQuestion: What complication best explains the interval radiographic changes?"},{"id":"q01-09853bbe350348bf","specialty":"Musculoskeletal Radiology / Orthopedic Surgery","type":"Investigation Interpretation","month":"2026-04","claude_score":2.0,"gemini_score":0.0,"title":"Bipolar head dissociation: radiographic assessment of bipolar hemiarthroplasty dislocation and the role of the “O” sign","image_count":1,"has_response":false,"search_text":"The provided image is a magnified crop of the femoral head region on an anteroposterior pelvic radiograph. It was obtained immediately after a posterior dislocation of a cemented bipolar hip hemiarthroplasty (an implant in which an outer metal shell articulates with the native acetabulum while an inner femoral head sits inside that shell), before any reduction maneuver was attempted. Looking only at the outer radiodense ring in this image: (1) describe the specific abnormality in the ring's wall, and (2) explain why an overall round/continuous outer contour of this ring is not sufficient by itself to rule out a mechanically unstable, dissociation-prone construct, and what additional imaging step would be needed to fully assess that risk.\nCase: An anteroposterior pelvic radiograph was obtained immediately after posterior dislocation of a cemented bipolar hip hemiarthroplasty and before reduction. The implant has an outer metal shell that articulates with the native acetabulum and an inner femoral head within the shell.\n\nImages: The image is a magnified crop of the femoral head region. Assess only the outer radiodense ring.\n\nQuestion: What wall abnormality is present and what does it indicate, why does the round contour not exclude instability or dissociation, and what further imaging is needed?"},{"id":"q01-0f0dd69644414d4e","specialty":"Neurology / Movement Disorders","type":"Investigation Interpretation","month":"2026-03","claude_score":0.0,"gemini_score":2.0,"title":"Paroxysmal Hemidystonia as the Presenting Manifestation of Previously Undiagnosed Diabetes Mellitus","image_count":1,"has_response":true,"search_text":"A man in his 70s had a 3-month history of stereotyped brief dystonic-appearing spells (twisting movements ending in a brief sustained abnormal posture) affecting the right face, arm, and leg, occurring roughly twice per minute. During the symptomatic period, plasma glucose was markedly elevated (494 mg/dL) with HbA1c 16.1%; serum electrolytes, EEG, CSF analysis, and an autoimmune encephalopathy panel were all unremarkable. The spells resolved completely within 3 days of starting glucose-lowering treatment, as plasma glucose fell to 180 mg/dL, and the neurologic exam between spells had always been normal. The provided image shows two brain studies from this same patient, arranged left (panel A) and right (panel B): panel A is a structural brain MRI obtained during the symptomatic period; panel B is a whole-brain 18F-FDG PET/CT obtained about one month later, after the movements had fully resolved and with plasma glucose then stable at 136 mg/dL. Using the appearance of both panels together with the clinical timeline, state (1) whether either panel shows an acute or metabolic basal ganglia abnormality that could serve as a direct imaging correlate of the right-sided movements, and (2) explain why the abnormality that IS visible should not be interpreted as the cause of the dystonic spells, and what the more defensible interpretation of the basal ganglia finding is instead.\nCase: A man in his 70s had 3 months of stereotyped, brief, dystonic-appearing spells. Twisting of the right face, arm, and leg ended in a brief sustained abnormal posture. The spells occurred about twice per minute.\n\nDuring the symptomatic period, plasma glucose was 494 mg/dL and HbA1c was 16.1%. Serum electrolytes, EEG, CSF analysis, and an autoimmune encephalopathy panel were unremarkable. His neurologic examination was always normal between spells.\n\nThe spells resolved completely within 3 days of starting glucose-lowering treatment, as plasma glucose fell to 180 mg/dL.\n\nImages: Panel A, on the left, is a structural brain MRI obtained during the symptomatic period. Panel B, on the right, is a whole-brain 18F-FDG PET/CT obtained about one month later. By then, the movements had fully resolved and plasma glucose was stable at 136 mg/dL.\n\nQuestion: What is the most defensible interpretation of both panels in relation to the right-sided movements?"},{"id":"q01-18d052345deb8168","specialty":"Perinatal/Fetal Radiology","type":"Investigation Interpretation","month":"2026-05","claude_score":2,"gemini_score":0.0,"title":"A case report and literature review on imaging manifestations of immature teratoma in fetal oral cavity with concurrent intracranial abnormalities","image_count":1,"has_response":false,"search_text":"The provided image shows two postnatal CT views of a large solid-cystic mass that filled a stillborn fetus's oral cavity and oropharynx, with broad attachment to the skull base, palate, and mandible (left: sagittal view; right: axial view through the mandible, both with the mass outlined). Based only on the density pattern and osseous findings visible in this image, is this mass more consistent with a mature teratoma or an immature teratoma? Name the two specific imaging findings in the image that support your answer.\nCase: A postnatal CT of a stillborn fetus shows a large solid-cystic mass filling the oral cavity and oropharynx. The mass is broadly attached to the skull base, palate, and mandible.\n\nImages: The left panel is a sagittal view. The right panel is an axial view through the mandible. The mass is outlined in both panels.\n\nQuestion: Based only on the CT density pattern and osseous findings, is the mass more consistent with a mature or immature teratoma?"},{"id":"q01-2f62cfe413f85181","specialty":"Clinical Pharmacology/Critical Care","type":"Investigation Interpretation","month":"2026-06","claude_score":2.0,"gemini_score":0.0,"title":"First case report of polymyxin B-induced drug fever in a patient with carbapenem-resistant Acinetobacter baumannii pneumonia","image_count":1,"has_response":false,"search_text":"The provided image shows a week-long fever trend (vertical axis, °C; horizontal axis, hospital days) in a mechanically ventilated adult being treated with a last-line polypeptide antibiotic for a multidrug-resistant Gram-negative pneumonia. The antibiotic was given by two routes: blue arrows mark intravenous infusions and red arrows mark nebulized doses of the same drug. Over this same interval, C-reactive protein, white-cell count, and neutrophil count did not rise or fall in parallel with the fever curve, whereas the eosinophil count increased during the febrile days. Blood pressure and respiratory rate stayed relatively stable throughout, and the antibiotic regimen for the underlying pneumonia itself was changed only after the fever had already been persisting for many days without improvement in infection markers. Based on how quickly the fever rises after doses and how quickly it falls once the drug is stopped (as shown in the image), together with the described laboratory pattern, is this fever more consistent with an immediate-type (rapid mast-cell/histamine or IgE-like) hypersensitivity reaction or a delayed T-cell-mediated (type IV) hypersensitivity reaction? Name two specific features visible in the image or described above that support your choice.\nCase: A mechanically ventilated adult with multidrug-resistant Gram-negative pneumonia received a last-line polypeptide antibiotic intravenously and by nebulization. During the same week, C-reactive protein, white-cell count, and neutrophil count did not change in parallel with the fever, while eosinophils increased on febrile days. Blood pressure and respiratory rate remained relatively stable. The pneumonia antibiotic regimen was changed only after the fever had persisted for many days without improvement in infection markers.\n\nImages: The graph plots temperature (°C) over hospital days. Blue arrows mark intravenous infusions, and red arrows mark nebulized doses. It shows the timing of temperature rises after doses and the decline after the drug was stopped.\n\nQuestion: Does this pattern favor immediate-type hypersensitivity or delayed T-cell-mediated type IV hypersensitivity, and which two findings support your choice?"},{"id":"q01-3a0f6548ea7cc4f3","specialty":"Adult Congenital Heart Disease","type":"Diagnosis","month":"2026-06","claude_score":2.0,"gemini_score":0.0,"title":"Adult-onset diagnosis of interrupted aortic arch presenting with uncontrolled hypertension","image_count":1,"has_response":false,"search_text":"The provided image shows two sagittal CT reconstructions of the thoracoabdominal aorta from the same adult patient: left = at initial evaluation for hypertension that had remained uncontrolled (170/80 mmHg) despite 8 years of antihypertensive drug therapy, with a white arrow marking a focal abnormality in the aorta just distal to the origin of a markedly dilated great vessel arising from the arch; right = follow-up CT obtained about 1 year after a bypass graft was surgically placed connecting that dilated great vessel to the descending aorta. At initial presentation the patient had no history of intermittent claudication, no cardiac murmur on exam, and bilaterally symmetric but reduced ankle-brachial indices (0.5 on both sides); transoesophageal echocardiography excluded a patent ductus arteriosus and any other congenital anomaly. (1) Name the anatomic lesion marked by the arrow in the left-hand image. (2) Explain why, before surgery, this lesion produced a symmetric (rather than side-differential) reduction in lower-limb pulses and perfusion.\nCase: An adult had hypertension of 170/80 mmHg despite 8 years of antihypertensive therapy. There was no intermittent claudication or cardiac murmur. The ankle-brachial index was 0.5 bilaterally. Transoesophageal echocardiography excluded a patent ductus arteriosus and other congenital anomalies.\n\nImages: Sagittal CT reconstructions show the thoracoabdominal aorta. The left image is from the initial evaluation. The arrow marks a focal aortic abnormality just distal to the origin of a markedly dilated great vessel arising from the arch. The right image was obtained about 1 year after surgical placement of a bypass graft from that vessel to the descending aorta.\n\nQuestion: What is the arrow-marked aortic lesion?"},{"id":"q01-4d81f8f3eec6849c","specialty":"Orthopedic Trauma / Vascular Surgery","type":"Investigation Interpretation","month":"2026-06","claude_score":2.0,"gemini_score":0.0,"title":"Staged limb salvage of a Gustilo–Anderson type IIIC open distal tibial gunshot fracture using cross-leg pedicle flap and delayed intramedullary nailing with bone grafting: a case report","image_count":1,"has_response":false,"search_text":"The provided image shows two adjacent axial CT-angiography slices (bone window) of the calf, obtained after a close-range gunshot injury that produced a comminuted distal tibia/fibula fracture with retained metallic fragments (the bright fragments visible on both slices). On the left slice, an arrow marks one of the paired deep crural vessels running just posteromedial to the fibula; unlike the neighboring vessel, which is filled with contrast, the marked vessel shows no contrast opacification, indicating a segmental disruption at this level. At surgical exploration performed at the same time, one specific named crural artery was found injured and was then repaired. Clinically, the anterior tibial artery was non-palpable and thought to be compromised by the zone of injury, yet weak handheld Doppler signals were still detectable distally before repair, and perfusion improved once the repair was completed. (1) Which named artery does the arrow indicate, and (2) through which alternate named artery and physiological route was distal foot perfusion partially maintained before this artery was repaired?\nCase: A close-range gunshot caused comminuted distal tibia and fibula fractures with retained metallic fragments. The anterior tibial artery was non-palpable and was thought to be compromised. Weak distal handheld Doppler signals remained before vascular repair, and perfusion improved after repair.\n\nImages: Two adjacent axial CT angiography images of the calf are shown in a bone window. In the left image, the arrow marks a deep crural vessel posteromedial to the fibula. The marked vessel has segmental loss of contrast opacification, while the neighboring vessel remains opacified. Surgical exploration confirmed injury to the marked artery, which was repaired.\n\nQuestion: Which artery is marked, and what collateral pathway maintained partial distal foot perfusion before repair?"},{"id":"q01-9f31fe32d17a62c4","specialty":"Hematology","type":"Investigation Interpretation","month":"2026-04","claude_score":2.0,"gemini_score":0.0,"title":"Desiderosmia-Associated Iron Deficiency: A Case Report and Review of the Literature","image_count":1,"has_response":false,"search_text":"The provided image plots a patient's serial total iron (mcg/dL, left axis) and ferritin (ng/mL, left axis) together with hemoglobin (g/dL, right axis) from October 2023 through June 2025. Vertical dashed markers indicate, in chronological order: onset of worsening symptomatic iron deficiency, a first intravenous (IV) iron infusion, and a second IV iron infusion. A compulsive craving to smell pine-scented cleaning products first appeared at the earliest marked time point and resolved shortly after the first IV iron infusion; it did not recur later even though the iron indices declined again before the second IV iron infusion. Using only the shapes of the three plotted trend lines in the image, identify which single biomarker's trajectory most closely tracks the appearance and disappearance of this craving symptom, and which biomarker's trajectory is least consistent with the symptom's timing. Justify your answer by describing the specific inflection points you observe for each line.\nCase: A compulsive craving to smell pine-scented cleaning products appeared at the earliest marked time point, when symptomatic iron deficiency was worsening. The craving resolved shortly after the first intravenous iron infusion. It did not recur when the iron indices declined before a second infusion.\n\nImages: The graph plots total iron (mcg/dL) and ferritin (ng/mL) on the left axis and hemoglobin (g/dL) on the right axis from October 2023 through June 2025. Relevant dashed markers identify worsening symptomatic iron deficiency and the first and second intravenous iron infusions. Use only the shapes of the three lines, and describe the inflection points supporting both selections.\n\nQuestion: Which biomarker trajectories match the craving timeline most and least closely?"},{"id":"q01-d2d6f057ef7520bc","specialty":"Hematology","type":"Investigation Interpretation","month":"2026-05","claude_score":2.0,"gemini_score":0.0,"title":"Novel\n                    <i>ABCG5</i>\n                    and\n                    <i>ABCG8</i>\n                    Variants in Sitosterolemia: Insights Into Haemolysis, Calcium Dysregulation and Therapeutic Challenges","image_count":1,"has_response":false,"search_text":"Two sisters with lifelong hemolytic anemia, splenomegaly, stomatocytes on smear, and normal osmotic fragility, hemoglobin studies, and Coombs testing were later found to carry a homozygous nonsense variant in a gene encoding a sterol-efflux transporter. Their red blood cells underwent density-gradient centrifugation. The provided image shows tubes for healthy controls (two columns) alongside the two sisters' cells, each obtained before and after 6 months of a sterol-lowering drug that cut their plasma plant-sterol levels by roughly 15-20%; L, M, and H mark the low-, medium-, and high-density bands from top to bottom. Despite the drop in plant-sterol levels, hemoglobin did not improve (one sister's hemoglobin actually fell further), and functional testing on their cells showed significantly elevated intracellular calcium at rest, an exaggerated calcium rise under osmotic swelling stress, and increased reactive oxygen species relative to controls. Using the density pattern in the image together with these functional findings, explain what red-cell abnormality is responsible for the persistent hemolysis and describe the ion-transport/membrane mechanism that generates it.\nCase: Two sisters had lifelong hemolytic anemia, splenomegaly, and stomatocytes on blood smears. Osmotic fragility, hemoglobin studies, and Coombs testing were normal. Both carried a homozygous nonsense variant in a gene encoding a sterol-efflux transporter.\n\nTheir red cells underwent density-gradient centrifugation before and after six months of sterol-lowering treatment. Plasma plant-sterol levels fell by about 15–20%, but hemoglobin did not improve and fell further in one sister. Compared with controls, their cells had significantly higher resting intracellular calcium, a greater calcium rise during osmotic swelling stress, and increased reactive oxygen species.\n\nImages: The two left columns are healthy controls. The middle pair shows PI before and after treatment, and the right pair shows PII before and after treatment. L, M, and H mark the low-, medium-, and high-density bands from top to bottom.\n\nQuestion: What red-cell mechanism explains the density pattern and ongoing hemolysis despite treatment?"},{"id":"q01-def7a51ec093ec12","specialty":"Otolaryngology / Head and Neck Radiology","type":"Investigation Interpretation","month":"2026-05","claude_score":2.0,"gemini_score":0.0,"title":"Tonsillar Fullness Mimicking Malignancy Secondary to a Cervical Osteophyte: A Case Report","image_count":1,"has_response":false,"search_text":"An elderly woman presents with several weeks of globus sensation and a subjective feeling of a mass in the back of her throat. On exam, the left palatine tonsil is firm and fuller than the right, non-tender, with no other areas of induration. Flexible laryngoscopy shows a widely patent airway, normal bilateral vocal fold mobility, and no mucosal lesions or masses anywhere in the oropharynx, hypopharynx, or larynx. There is no palpable cervical lymphadenopathy, and she denies tobacco use, alcohol use, HPV exposure, weight loss, fevers, or night sweats. The provided image is a single axial slice from a contrast-enhanced neck CT at the level of the oropharynx; the circled/arrowed structure corresponds to the area of clinical concern. Based on the attenuation and location of the marked structure on this CT slice, together with the clinical and endoscopic findings above, what is the most likely explanation for this patient's tonsillar fullness, and what specific imaging feature argues against a mucosal malignancy such as squamous cell carcinoma or lymphoma?\nCase: An elderly woman has had several weeks of globus sensation and a feeling of a mass in the back of her throat. The left palatine tonsil is firm, fuller than the right, and non-tender. No other induration is present.\n\nFlexible laryngoscopy shows a widely patent airway, normal bilateral vocal fold mobility, and no mucosal lesion or mass in the oropharynx, hypopharynx, or larynx. She has no palpable cervical lymphadenopathy. She denies tobacco or alcohol use, HPV exposure, weight loss, fevers, and night sweats.\n\nImages: The supplied image is a single axial slice from a contrast-enhanced neck CT at the oropharyngeal level. The circle and arrow mark the area of clinical concern.\n\nQuestion: What is the most likely explanation for the left tonsillar fullness?"},{"id":"q02-2dbe33ac7274a8e1","specialty":"Pathology / Dermatology","type":"Diagnosis","month":"2026-06","claude_score":0.0,"gemini_score":2.0,"title":"In vitro study of TSC1 deficiency in preadipocytes: insights into development and treatment options for tuberous sclerosis related lipomatosis","image_count":1,"has_response":false,"search_text":"The provided image shows two magnifications of a hematoxylin-eosin-stained section of a resected soft-tissue mass composed predominantly of mature fat cells (top: lower-power view; bottom: higher-power view of the same tissue). Based on the histologic features visible in the image, what specific tissue component—beyond the mature adipocytes themselves—is present in abundance, and what more specific histologic diagnosis does this component indicate compared with a diagnosis of a simple/ordinary lipoma?\nCase: An H&E-stained section of a resected soft-tissue mass is composed predominantly of mature adipocytes.\n\nImages: The top panel is a lower-power view. The bottom panel is a higher-power view of the same tissue.\n\nQuestion: What more specific histologic diagnosis, rather than an ordinary lipoma, is indicated by the abundant non-adipocyte component?"},{"id":"q02-9df185005ed4b05f","specialty":"Pathology / Infectious Disease","type":"Investigation Interpretation","month":"2026-05","claude_score":2.0,"gemini_score":0.0,"title":"Pulmonary sarcoidosis complicated with pulmonary cryptococcosis: a case report","image_count":1,"has_response":false,"search_text":"An adult patient developed a cavitating lung nodule that had enlarged over several months despite corticosteroid therapy given for an unrelated biopsy-proven granulomatous lymph node condition. Biopsy tissue taken from this cavitating lung nodule was examined with two different histochemical stains. The provided image shows two adjacent fields of this lung biopsy tissue, each stained differently: left = numerous round structures highlighted by yellow arrows against a pink/purple background; right = numerous round structures highlighted by red arrows, appearing black against a light green/teal background. On admission, this patient's serum (1→3)-β-D-glucan assay, galactomannan antigen, and serum cryptococcal antigen were all negative, as was initial bronchoscopic microbiological testing for fungi. Based on the size, shape, and staining pattern of the structures marked in both panels, what organism is causing this lung lesion, and what morphological feature identifies it?\nCase: An adult developed a cavitating lung nodule that enlarged over several months despite corticosteroid therapy for an unrelated, biopsy-proven granulomatous lymph node condition. On admission, serum (1→3)-β-D-glucan, galactomannan antigen, and cryptococcal antigen tests were negative. Initial bronchoscopic testing for fungi was also negative. Biopsy tissue from the nodule was examined with two histochemical stains.\n\nImages: Panel A (left) shows numerous round structures marked by yellow arrows against a pink-purple background. Panel B (right) shows numerous round, black structures marked by red arrows against a light green-teal background.\n\nQuestion: What organism is causing the cavitating lung lesion?"},{"id":"q02-06ced9cbb670274e","specialty":"Ophthalmology - Cornea/Infectious Disease","type":"Investigation Interpretation","month":"2026-05","claude_score":2.0,"gemini_score":0.0,"title":"Fungal Keratitis Caused by Aureobasidium pullulans: A Case Report","image_count":0,"has_response":false,"search_text":"A 52-year-old patient presented with a corneal ulcer of two months' duration that had not improved despite broad-spectrum topical antifungal and antibacterial therapy, and had not perforated or deepened during that time. Slit-lamp exam showed only about 1 mm of surrounding stromal infiltration and mild oedema, with the ulcer floor covered by greyish exudate and minimal surrounding inflammation. A KOH wet mount of a corneal scraping showed thin, septate, hyaline fungal hyphae with acute-angle branching, but fungal culture required roughly three weeks to yield visible growth. Based on this indolent clinical course and this microscopy/culture pattern, which broad category of filamentous fungal keratitis pathogens is most consistent with this presentation, and what two features of the clinical course argue against the two more common fungal causes of keratitis?\nCase: A 52-year-old patient has had a corneal ulcer for 2 months. It has not improved with broad-spectrum topical antifungal and antibacterial therapy. During this time, it has neither deepened nor perforated.\n\nSlit-lamp examination shows about 1 mm of surrounding stromal infiltration and mild oedema. Greyish exudate covers the ulcer floor, with minimal surrounding inflammation.\n\nA KOH wet mount of a corneal scraping shows thin, septate, hyaline fungal hyphae with acute-angle branching. Fungal culture takes about 3 weeks to produce visible growth.\n\nQuestion: Which broad category of filamentous fungal pathogen best fits this presentation?"},{"id":"q02-702880b5aa3bbe3c","specialty":"Cardiothoracic Surgery","type":"Treatment","month":"2026-04","claude_score":2.0,"gemini_score":0.0,"title":"Acute mitral regurgitation following giant coronary artery aneurysm resection: a case report","image_count":0,"has_response":false,"search_text":"During planning for coronary bypass in a patient with a giant proximal LAD aneurysm plus severe disease in other coronary branches, the surgical team found that both internal thoracic arteries (left and right) were unsuitable as bypass conduits and instead used a free gastroepiploic artery graft together with a saphenous vein graft. Based on findings from the preoperative workup and intraoperative inspection, what specific problem made each internal thoracic artery unusable for grafting?\nCase: A patient with a giant proximal LAD aneurysm and severe disease in other coronary branches was scheduled for coronary bypass. During the preoperative workup and intraoperative inspection, both internal thoracic arteries were found unsuitable as conduits. The surgeons instead used a free gastroepiploic artery graft and a saphenous vein graft.\n\nQuestion: What specific problem made each internal thoracic artery unsuitable for grafting?"},{"id":"q03-1f7e35ef944c1df8","specialty":"Endocrine Oncology","type":"Treatment Response","month":"2026-04","claude_score":2.0,"gemini_score":0.0,"title":"Immunotherapy response in microsatellite-stable poorly differentiated thyroid carcinoma with mismatch repair deficiency and high tumor mutational burden","image_count":0,"has_response":false,"search_text":"After starting first-line immune checkpoint blockade, a patient's primary neck tumor shrank substantially while distant sites (lymph nodes, lungs, bones) remained stable for several months. She subsequently developed progression limited to the original tumor bed/regional area while distant disease control was preserved. Describe how this isolated pattern of progression was managed, and state the approximate total duration of disease control achieved with this treatment strategy before any additional systemic therapy became necessary.\nCase: After first-line immune checkpoint blockade, the primary neck tumor shrank substantially. Distant lymph node, lung, and bone disease remained stable for several months. The patient later developed progression limited to the original tumor bed and regional area, while distant disease control continued.\n\nQuestion: How was the isolated locoregional progression managed?"},{"id":"q03-6d3b6c97fd991acf","specialty":"Child and Adolescent Psychiatry","type":"Treatment","month":"2026-04","claude_score":2,"gemini_score":0.0,"title":"Case Report: Deprescribing psychotropic medication with an adolescent boy with complex emotional and behavioural challenges","image_count":0,"has_response":false,"search_text":"An adolescent was concurrently prescribed two antipsychotics for overlapping behavioural indications — olanzapine (2.5 mg twice daily plus 5 mg at midday, with an additional as-needed dose for agitation) and quetiapine (25 mg twice daily) — alongside a stimulant, an alpha-2 agonist, and melatonin. The clinical team decided to discontinue the two antipsychotics one at a time rather than simultaneously. State which of the two antipsychotics was discontinued first, and explain the two-part clinical rationale: (a) why that particular drug (rather than the other antipsychotic) was chosen to be discontinued first, and (b) how the clinical outcome observed after that first discontinuation was then used to justify subsequently attempting to discontinue the second antipsychotic.\nCase: An adolescent received two antipsychotics for overlapping behavioural indications. Olanzapine was prescribed at 2.5 mg twice daily and 5 mg at midday, with an additional dose as needed for agitation. Quetiapine was prescribed at 25 mg twice daily. The patient also received a stimulant, an alpha-2 agonist, and melatonin. The team decided to discontinue the antipsychotics one at a time.\n\nQuestion: What was the discontinuation sequence, and what clinical rationale supported each step?"},{"id":"q01-045e3a514655b10d","specialty":"Neuro-Oncology","type":"Investigation Interpretation","month":"2026-04","claude_score":2.0,"gemini_score":2.0,"title":"PART as a Negative Outcome Modifier of Glioblastoma Treatment, Case Report","image_count":2,"has_response":false,"search_text":"An elderly woman with a right frontal high-grade glioma underwent gross total resection followed by combined chemoradiation and, after recovery, two cycles of adjuvant temozolomide. During her second adjuvant cycle she developed new impulsivity, disorientation, visual hallucinations, progressively worsening somnolence, and urinary incontinence. These symptoms continued to worsen even after all tumor-directed treatment was stopped, and she died several months later. The provided images are both axial FLAIR-weighted brain MRI scans from this patient, in this order: left/first image at the time of her original diagnosis, right/second image obtained months later, around the time her new behavioral and cognitive decline began. Radiologic review at the time of decline described the resection cavity as stable, with no new mass lesion or pathologic enhancement. Autopsy performed after death showed, in both hippocampi, tau-positive neurofibrillary tangles concentrated in the trans-entorhinal and entorhinal cortices, with only rare, mild beta-amyloid plaques (a pattern corresponding to Braak stage III neurofibrillary pathology with minimal amyloid burden), and a substantia nigra with normal neuronal density and no Lewy bodies. Based on the imaging comparison and these autopsy findings, what process most likely accounts for her late, subacute neurobehavioral decline, and why do the findings argue against tumor recurrence or progression as the explanation?\nCase: An elderly woman with a right frontal high-grade glioma underwent gross total resection and combined chemoradiation. After recovery, she received two cycles of adjuvant temozolomide. During the second cycle, she developed new impulsivity, disorientation, visual hallucinations, worsening somnolence, and urinary incontinence. Her symptoms continued to worsen after tumor-directed treatment was stopped, and she died several months later.\n\nImages: The first and second images are axial FLAIR-weighted brain MRIs obtained at diagnosis and months later, respectively. The second image was obtained around the onset of her behavioral and cognitive decline. At that time, radiologic review found a stable resection cavity with no new mass or pathologic enhancement.\n\nAutopsy showed tau-positive neurofibrillary tangles in both hippocampi, concentrated in the trans-entorhinal and entorhinal cortices. Beta-amyloid plaques were rare and mild, corresponding to Braak stage III neurofibrillary pathology with minimal amyloid burden. The substantia nigra had normal neuronal density and no Lewy bodies.\n\nQuestion: What process best explains her late, subacute decline when the MRI comparison and autopsy findings are considered together?"},{"id":"q01-051597128c053307","specialty":"Cardiology/Rheumatology","type":"Treatment Response","month":"2026-03","claude_score":2,"gemini_score":2.0,"title":"Libman-Sacks Endocarditis as the Initial Presentation of Systemic Lupus Erythematosus and Antiphospholipid Syndrome: A Multisystem Diagnostic Challenge","image_count":2,"has_response":true,"search_text":"A woman in her twenties with newly identified antinuclear antibodies, anti-double-stranded DNA antibodies, lupus anticoagulant, anticardiolipin IgG, and anti-β2-glycoprotein I IgG presented with severe mitral regurgitation and echogenic masses on both mitral leaflets on echocardiography (blood cultures negative, no prior antibiotics, patient afebrile), plus a reduced left ventricular ejection fraction (LVEF) of 45%. She was treated with pulse corticosteroids, hydroxychloroquine, cyclophosphamide, and anticoagulation. A follow-up echocardiogram was obtained after this therapy; at that time her LVEF had risen to 52%, but severe mitral regurgitation was still present. The provided images show the same echocardiographic view, with yellow arrows marking the valve masses, at two time points: left image = baseline (at presentation), right image = follow-up (after immunosuppressive therapy). Based on comparing the appearance of the marked valve masses across the two images together with the LVEF trend, state in 2-3 sentences which component of this patient's cardiac disease responded to treatment and which component did not, and what this implies about her longer-term cardiac management.\nCase: A woman in her twenties had newly identified antinuclear antibodies, anti-double-stranded DNA antibodies, lupus anticoagulant, anticardiolipin IgG, and anti-β2-glycoprotein I IgG. She was afebrile, and blood cultures obtained without prior antibiotics were negative. Echocardiography showed severe mitral regurgitation, echogenic masses on both mitral leaflets, and an LVEF of 45%.\n\nShe received pulse corticosteroids, hydroxychloroquine, cyclophosphamide, and anticoagulation. After treatment, her LVEF was 52%, but severe mitral regurgitation persisted.\n\nImages: Images 1 and 2 show the same echocardiographic view at baseline and after treatment, respectively. Yellow arrows mark the valve masses.\n\nQuestion: How did the valve masses, mitral regurgitation, and left ventricular function respond to treatment?"},{"id":"q01-0ee6777822c565cb","specialty":"Orthopedic Trauma / Musculoskeletal Radiology","type":"Investigation Interpretation","month":"2026-04","claude_score":2.0,"gemini_score":2.0,"title":"CBCT-Guided Iliosacral Screw Osteosynthesis in a Pregnant Woman: A Case Report and Literature Review","image_count":2,"has_response":false,"search_text":"A pregnant patient in the early second trimester sustained high-energy blunt pelvic trauma with severe left-sided pain and shortening of the left lower limb. The provided images are two axial CT sections obtained at presentation (left: axial view through the level of the sacroiliac joints; right: oblique axial reconstruction through the level of the acetabula). Based on the pattern of bony disruption visible in these two images, characterize the mechanical stability of this pelvic ring injury: state whether it is rotationally stable or unstable and identify the plane (vertical vs. horizontal/rotational) in which instability occurs, and name the two distinct injury components shown across the two images that together produce this instability pattern.\nCase: A pregnant patient in the early second trimester sustained high-energy blunt pelvic trauma. She has severe left-sided pain and shortening of the left lower limb.\n\nImages: Image 1 is an axial CT section at the sacroiliac joints. Image 2 is an oblique axial reconstruction at the acetabula.\n\nQuestion: Is the pelvic ring rotationally stable or unstable, in which plane is it unstable, and what two injury components are shown?"},{"id":"q01-138d6ba8104a7f8b","specialty":"Endocrinology","type":"Investigation Interpretation","month":"2026-07","claude_score":2.0,"gemini_score":2.0,"title":"Case Report: Pediatric ACTH-secreting pituitary adenoma presenting with hypertension and anuria","image_count":2,"has_response":false,"search_text":"An adolescent boy had a 2-month history of 20 kg weight gain, truncal acne, abdominal striae, and a hypertensive crisis (blood pressure 180/120 mmHg) with hypokalemia (potassium 2.16-3.0 mmol/L; reference 3.7-5.2). Endocrine testing showed markedly elevated ACTH (190 pg/mL; reference 0-46 pg/mL) with loss of the normal cortisol circadian rhythm (cortisol was above the reference range at every sampled time of day, including late night). Pituitary MRI identified a 6 mm x 5 mm cystic focus in the left anterior pituitary. Two coronal T1-weighted images of this focus, at the same level and with an arrow marking the same structure, are provided: the provided image on the left is before intravenous contrast, and the provided image on the right is after intravenous contrast. Using both the imaging pattern shown and the hormonal data above, what is the single best explanation for this pituitary lesion, and what feature of the hormonal data argues against a hormonally silent cystic lesion such as a Rathke cleft cyst as the alternative explanation?\nCase: An adolescent boy gained 20 kg over 2 months and developed truncal acne, abdominal striae, and a hypertensive crisis. His blood pressure was 180/120 mmHg. He had hypokalemia, with potassium levels of 2.16–3.0 mmol/L (reference 3.7–5.2).\n\nACTH was 190 pg/mL (reference 0–46). Cortisol exceeded the reference range at every sampled time, including late at night, with loss of its normal circadian rhythm. Pituitary MRI showed a 6 × 5 mm cystic focus in the left anterior pituitary. A hormonally silent cystic lesion, such as a Rathke cleft cyst, was considered as an alternative.\n\nImages: Images 1 and 2 are coronal T1-weighted MR images at the same level, with arrows marking the same focus. Image 1 was obtained before intravenous contrast and Image 2 after contrast.\n\nQuestion: What diagnosis best explains the pituitary lesion, MRI pattern, and hormonal findings?"},{"id":"q01-233d02a1fd70f518","specialty":"Musculoskeletal Radiology / Orthopedics","type":"Investigation Interpretation","month":"2026-05","claude_score":2.0,"gemini_score":2.0,"title":"Madelung Disease Associated With Bilateral Avascular Necrosis of the Femoral Head: A Case Report of a Rare Disorder","image_count":1,"has_response":false,"search_text":"A 45-year-old man presented with 5 months of progressive bilateral hip pain, aggravated by walking and weight-bearing, with restricted hip movement. There was no history of trauma, corticosteroid use, sickle cell disease/trait, caisson disease, or known coagulopathy; he did have a long history of heavy alcohol use. The provided image shows two coronal MRI sequences of both hips obtained during this work-up: left panel, a fluid-sensitive (STIR) sequence; right panel, a T1-weighted non-fat-suppressed sequence (arrows mark the femoral heads bilaterally). Based on the femoral head contour, joint space, and adjacent bone/soft-tissue appearance shown in the image, what stage of femoral head avascular necrosis (using the Ficat and Arlet staging system) is present bilaterally, and what single imaging feature visible here is the key discriminator that places this case at that stage rather than an earlier one?\nCase: A 45-year-old man has had progressive bilateral hip pain for 5 months. The pain worsens with walking and weight-bearing, and both hips have restricted movement. He has no history of trauma, corticosteroid use, sickle cell disease or trait, caisson disease, or known coagulopathy. He has a long history of heavy alcohol use.\n\nImages: Coronal MRI of both hips obtained during the work-up. Panel A on the left is a fluid-sensitive STIR sequence. Panel B on the right is a non-fat-suppressed T1-weighted sequence. The arrows indicate both femoral heads. The images show the femoral head contours, joint spaces, and adjacent bone and soft tissues.\n\nQuestion: What Ficat and Arlet stage of femoral head avascular necrosis is present bilaterally?"},{"id":"q01-4cb026bfa87c532c","specialty":"Interventional Cardiology","type":"Mechanism","month":"2026-03","claude_score":2,"gemini_score":2.0,"title":"Balloon Rupture-Facilitated Grenadoplasty in Complex Left Anterior Descending Chronic Total Occlusion","image_count":1,"has_response":true,"search_text":"A 66-year-old man presented with an inferolateral ST-segment elevation myocardial infarction. Angiography showed a critical stenosis of a dominant left circumflex artery (treated acutely) and a separate, heavily calcified chronic total occlusion (CTO) at the origin of the left anterior descending artery (LAD), which arose independently from the circumflex (no left main). Days later, staged antegrade CTO recanalization of the LAD was attempted. Repeated guidewire attempts (including an escalation from a polymer-jacketed wire to a stiffer, tapered-tip wire) at the proximal cap repeatedly tracked into the subintimal space rather than the true lumen, reflecting a resistant calcified cap. A small semi-compliant balloon was then inflated at high pressure (16 atm) at the ambiguous entry point to try to modify the cap. The provided image shows two antegrade coronary angiograms from this same LAD CTO procedure, in the same projection: left, the baseline appearance of the calcified ostial LAD occlusion before any balloon work; right, the appearance immediately after the high-pressure balloon inflation described above. The patient remained hemodynamically stable throughout, with no pericardial effusion. Based on the change between the two images and the preceding wire-escalation history, what acute procedural event has occurred in the right-hand image, and by what mechanism did this event subsequently allow the guidewire to reach the true distal lumen?\nCase: A 66-year-old man underwent staged antegrade recanalization of a heavily calcified chronic total occlusion at the ostium of the LAD. The LAD arose independently from the circumflex, with no left main.\n\nRepeated guidewire attempts, escalating from a polymer-jacketed wire to a stiffer tapered-tip wire, entered the subintimal space rather than the true lumen. A small semi-compliant balloon was then inflated at 16 atm at the ambiguous entry point to modify the resistant proximal cap. The patient remained hemodynamically stable, with no pericardial effusion.\n\nImages: Both antegrade coronary angiograms are from the same procedure and projection. The left panel is the baseline image before balloon inflation. The right panel was obtained immediately after high-pressure inflation.\n\nQuestion: What mechanism produced the new right-panel appearance and enabled guidewire passage into the true distal lumen?"},{"id":"q01-662414131c431db2","specialty":"Anesthesiology / Airway Management","type":"Investigation Interpretation","month":"2026-04","claude_score":2,"gemini_score":2.0,"title":"Ultrasound-Guided Airway Mapping and Regional Blocks in Post-radiation Cervicofacial Contractures: A Case Report","image_count":1,"has_response":false,"search_text":"A patient with post-radiation cervicofacial fibrosis (prior head-and-neck radiotherapy) has severe trismus and bilateral carotid arteries that are both displaced laterally away from the anatomic midline by fibrotic scarring. Standard surface landmarks for locating the cricothyroid membrane are unreliable in this setting. The provided image is a transverse point-of-care ultrasound view of the neck at the level of the cricoid cartilage; the bright vertical line marks the true anatomic midline, and a 1 cm scale bar is shown in the lower right. Using the visible position of the air-filled tracheal shadow (the dark dome with a bright anterior rim and shadowing beneath it) relative to the midline line and the scale bar, state (1) which direction and by roughly how much the trachea is shifted from the anatomic midline, and (2) how this finding should change where an emergency front-of-neck airway incision (cricothyroidotomy) is sited in this patient, given that the carotid vessels are splayed laterally on both sides rather than lying in their usual paramedian position.\nCase: A patient with post-radiation cervicofacial fibrosis after head-and-neck radiotherapy has severe trismus. Fibrotic scarring has displaced both carotid arteries laterally, away from the anatomic midline and their usual paramedian positions. Surface landmarks for the cricothyroid membrane are unreliable.\n\nImages: This transverse point-of-care ultrasound image was obtained at the level of the cricoid cartilage. The vertical line marks the true anatomic midline, and the lower-right scale bar represents 1 cm. The air-filled trachea appears as a dark dome with a bright anterior rim and posterior acoustic shadowing.\n\nQuestion: What is the tracheal displacement from the marked midline, and where should an emergency cricothyroidotomy incision be placed?"},{"id":"q01-6d70bb5a374e1f08","specialty":"Hematopathology","type":"Investigation Interpretation","month":"2026-06","claude_score":2.0,"gemini_score":2.0,"title":"A Rare Case of Plasmablastic Myeloma With Dual Kappa and Lambda mRNA Expression Presenting as a Solitary Hard Palate Tumor","image_count":1,"has_response":false,"search_text":"A patient with an aggressive marrow-based plasma cell neoplasm underwent bone marrow biopsy with paired immunohistochemistry (IHC) for kappa and lambda light chains and RNA in situ hybridization (RNA-ISH) for kappa and lambda mRNA, performed on serial sections of the same marrow specimen. The provided image shows, left to right on the top row, kappa IHC and lambda IHC, and left to right on the bottom row, kappa RNA-ISH and lambda RNA-ISH, all at the same magnification with 100 μm scale bars. Serum studies from the same patient showed a markedly elevated total IgG, suppressed IgA and IgM, and a serum free light chain pattern with mildly elevated free kappa but markedly elevated free lambda (kappa/lambda ratio approximately 0.02). Based on the pattern shown in the image together with the serum free light chain data, explain the biological phenomenon this discordance most likely reflects, and state which single testing modality (among protein IHC, serum free light chain assay, and RNA-ISH) most accurately reveals the underlying clonal light-chain transcriptional program in this tumor.\nCase: A patient with an aggressive marrow-based plasma cell neoplasm underwent bone marrow biopsy. Serial sections of the same specimen were tested for kappa and lambda light chains by IHC and for kappa and lambda mRNA by RNA-ISH.\n\nSerum studies showed markedly elevated total IgG, suppressed IgA and IgM, mildly elevated free kappa, and markedly elevated free lambda. The kappa/lambda ratio was approximately 0.02.\n\nImages: Upper row, left to right: kappa IHC and lambda IHC. Lower row, left to right: kappa RNA-ISH and lambda RNA-ISH. All panels are at the same magnification with 100 μm scale bars.\n\nQuestion: What biological phenomenon best explains the discordance between the image and serum free light-chain findings?"},{"id":"q01-6ece3eac597d72dd","specialty":"Musculoskeletal Radiology / Orthopedic Oncology","type":"Investigation Interpretation","month":"2026-07","claude_score":2.0,"gemini_score":2.0,"title":"Case Report: Giant cell reparative granuloma of the humerus and femur—two rare cases with atypical skeletal involvement","image_count":1,"has_response":false,"search_text":"A patient developed shoulder pain after a heavy-lifting injury. Contrast-enhanced CT of the proximal humerus showed a well-defined expansile osteolytic lesion (about 4x3x6 cm) with cortical thinning but no cortical breakthrough or periosteal reaction, and a contrast attenuation of roughly 87 Hounsfield units on the enhanced phase. The provided image shows three MRI sequences of this same lesion in the following order: left, axial T1-weighted image; middle, axial T2-weighted image; right, coronal contrast-enhanced T1-weighted image. Based on the signal pattern shown in the image together with the clinical and CT findings above, name the specific non-enhancing internal component responsible for the focal low-signal foci seen on the contrast-enhanced image, and state which single diagnosis this overall imaging pattern (heterogeneous enhancement, internal septation-like heterogeneity, cortical thinning without periosteal reaction, and these non-enhancing foci) most favors over the other two leading differentials for an expansile lytic bone lesion at this site.\nCase: A patient developed shoulder pain after a heavy-lifting injury. Contrast-enhanced CT of the proximal humerus showed a well-defined, expansile osteolytic lesion measuring about 4 × 3 × 6 cm. The cortex was thinned, without breakthrough or periosteal reaction. Enhanced-phase attenuation was about 87 HU.\n\nImages: Left, axial T1-weighted MRI; middle, axial T2-weighted MRI; right, coronal contrast-enhanced T1-weighted MRI. On the contrast-enhanced image, the lesion has heterogeneous enhancement, septation-like internal heterogeneity, and focal non-enhancing low-signal foci.\n\nQuestion: What single diagnosis does this overall imaging pattern most favor?"},{"id":"q01-78223c4cff6ad763","specialty":"Abdominal Radiology / Gastrointestinal Oncology","type":"Investigation Interpretation","month":"2026-07","claude_score":2,"gemini_score":2.0,"title":"Ileal malignant melanoma presenting with severe iron-deficiency anemia and active small-bowel bleeding: primary intestinal melanoma versus metastasis - a case report and narrative review","image_count":1,"has_response":false,"search_text":"An elderly man presented with recurrent melena and severe iron-deficiency anemia (hemoglobin 6.8 g/dL) requiring transfusion. A multiphasic contrast-enhanced abdominal CT was obtained. Nonvisual findings from the same study: a broad-based endoluminal small-bowel mass roughly 4 cm in size, marked hyperenhancement in the arterial phase with internal heterogeneity, focal asymmetric mural thickening with only partial luminal narrowing, only a few subcentimeter mesenteric nodes without clearly pathologic features, and no hepatic or peritoneal lesions. The provided image is a sagittal reconstruction from the same arterial-phase acquisition, centered on the abnormal bowel segment. Based on the mass's morphology in the image (broad-based polypoid endoluminal growth without an annular constricting configuration) together with the marked arterial hyperenhancement, absence of calcification, and absence of bulky adenopathy, which single entity in the radiologic differential for a bleeding hypervascular small-bowel mass is most compatible, and what CT feature seen in the image argues against an annular adenocarcinoma-type lesion as the cause?\nCase: An elderly man has recurrent melena and severe iron-deficiency anemia (hemoglobin 6.8 g/dL) requiring transfusion. Multiphasic contrast-enhanced abdominal CT shows a roughly 4-cm broad-based endoluminal small-bowel mass. The mass is markedly hyperenhancing and internally heterogeneous in the arterial phase. There is focal asymmetric mural thickening with partial luminal narrowing. Only a few subcentimeter mesenteric nodes are present, without clearly pathologic features. There is no calcification and no hepatic or peritoneal lesions.\n\nImages: The sagittal arterial-phase reconstruction is centered on the mass. It shows broad-based polypoid endoluminal growth rather than an annular constricting lesion.\n\nQuestion: Which single diagnosis is most compatible?"},{"id":"q01-813df7221b870392","specialty":"Ophthalmology","type":"Investigation Interpretation","month":"2026-06","claude_score":2.0,"gemini_score":2.0,"title":"Endophthalmitis Requiring Enucleation in a Sedated Critically Ill Patient: A Case Report","image_count":1,"has_response":false,"search_text":"The provided image is a single axial CT slice through both orbits, obtained in a sedated, mechanically ventilated adult who had developed progressive redness and swelling around one eye, with no history of direct trauma to that eye and no clinical signs of systemic infection at the time. The side labeled \"R\" in the image is the affected eye. Comparing the two globes and the surrounding orbital soft tissue in the image: (1) describe the abnormal globe-level and soft-tissue findings on the affected side, and (2) state which of these findings is recognized as an adverse prognostic sign for saving the eye in this clinical picture.\nCase: A sedated, mechanically ventilated adult developed progressive redness and swelling around one eye. There was no direct trauma to that eye and no clinical signs of systemic infection at the time.\n\nImages: The single axial CT image shows both orbits. The side labeled “R” is affected.\n\nQuestion: What globe and orbital soft-tissue abnormalities are present on the affected side, and which is an adverse sign for globe salvage?"},{"id":"q01-915f14cd2a506813","specialty":"Veterinary Neurosurgery","type":"Treatment","month":"2026-06","claude_score":2,"gemini_score":2.0,"title":"Case Report: Dorsal stabilization of an occipito-atlanto-axial malformation in a Miniature Dachshund using 3D planning and a patient-specific titanium implant","image_count":2,"has_response":false,"search_text":"A young small-breed dog presented with progressive proprioceptive ataxia in all four limbs, excessive claw wear, upper-motor-neuron reflex changes, and severe pain on neck flexion/extension, localizing to the C1-C5 spinal cord segments. The two provided sagittal images are from the same dog, same pre-surgical time point: the first image is a bone-window CT; the second is a T2-weighted MRI. Pre-surgical planning measured the basioccipital bone at the site that would be needed for a standard ventral fixation and found it averaged under 2.5 mm thick, too thin for secure screw purchase. Using the imaging findings together with this thickness measurement, explain (1) the anatomical source and mechanism of the spinal cord compression visible in the images, and (2) why a dorsal surgical approach was favored over a ventral one in this case.\nCase: A young small-breed dog had progressive proprioceptive ataxia in all four limbs, excessive claw wear, upper motor neuron reflex changes, and severe pain with neck flexion and extension. These findings localized the lesion to the C1–C5 spinal cord segments.\n\nImages: Panel A is a sagittal bone-window CT, and panel B is a sagittal T2-weighted MRI. Both were obtained from the same dog before surgery and show spinal cord compression. Preoperative planning found that the basioccipital bone at the intended site for standard ventral fixation averaged less than 2.5 mm thick, which was insufficient for secure screw purchase.\n\nQuestion: Why did the imaging and bone-thickness measurement favor a dorsal rather than ventral surgical approach?"},{"id":"q01-96a12edab9afec41","specialty":"Cardiology","type":"Investigation Interpretation","month":"2026-07","claude_score":2.0,"gemini_score":2.0,"title":"Magnetocardiography in diagnosis of MINOCA: a case series","image_count":1,"has_response":false,"search_text":"A woman presented with acute chest pain. High-sensitivity cardiac troponin I rose sharply within one hour (from about 160-fold to over 300-fold the upper limit of normal). Serial 12-lead ECGs were normal. Coronary angiography showed no stenosis, occlusion, or plaque in any vessel, and quantitative flow ratio (a physiological measure where values below ~0.80 indicate flow-limiting disease) was 0.90, 0.99, and 0.96 in the three major coronary territories — all non-flow-limiting. Echocardiography showed left ventricular dilatation with an ejection fraction of 45%. The provided image shows three cardiac MRI panels obtained the following day, all after contrast administration, left to right: (1) a four-chamber long-axis view, (2) a short-axis view at the mid-ventricular level, and (3) a zoomed short-axis view of the same mid-ventricular region. Red arrows in the images mark the abnormal region in each panel. Based on the location and transmural extent of the bright signal (hyperenhancement) shown in the images relative to the endocardial and epicardial surfaces, and integrating this with the angiographic and QFR findings above, does this imaging pattern support a true ischemic myocardial infarction or an inflammatory (myocarditis) process, and what specific feature of the enhancement pattern distinguishes the two?\nCase: A woman presented with acute chest pain. Within one hour, high-sensitivity cardiac troponin I rose from about 160 to more than 300 times the upper limit of normal. Serial 12-lead ECGs were normal.\n\nCoronary angiography showed no stenosis, occlusion, or plaque. Quantitative flow ratios in the three major coronary territories were 0.90, 0.99, and 0.96; values below about 0.80 indicate flow-limiting disease. Echocardiography showed left ventricular dilatation and an ejection fraction of 45%.\n\nImages: Contrast-enhanced cardiac MRI was performed the next day. Panel a is a mid-ventricular short-axis view, panel b is a four-chamber long-axis view, and panel c is an enlarged short-axis view of the same region. Red arrows mark the abnormal hyperenhancement. Assess its location and transmural extent relative to the endocardial and epicardial surfaces.\n\nQuestion: Does the enhancement pattern support ischemic myocardial infarction or myocarditis?"},{"id":"q01-a2a566a5a496606c","specialty":"Cardiovascular Surgery/Interventional Cardiology","type":"Investigation Interpretation","month":"2026-04","claude_score":2,"gemini_score":2.0,"title":"Acute Stanford Type A Aortic Dissection After Transcatheter Aortic Valve Implantation Necessitating the Bentall Procedure: A Case Report","image_count":1,"has_response":false,"search_text":"An elderly woman underwent transcatheter aortic valve implantation (TAVI) with a self-expandable valve for severe calcified aortic stenosis. During deployment the valve partially expanded, was displaced ('popped out') by antegrade aortic flow, was recaptured, and was then successfully redeployed slightly deeper. Post-procedure transesophageal echocardiography showed a mobile flap in the ascending aorta, but acoustic shadowing from the valve frame prevented assessment of the aortic root itself, so contrast-enhanced CT was obtained. The provided image is a cropped axial contrast CT slice at the level of the aortic root/sinus segment. The white-rimmed circular structure labeled 'T' is the true lumen (containing the valve stent); the upper red arrow marks a hematoma and the lower red arrow marks active contrast opacification, both within the surrounding false lumen at this same level. Elsewhere along the aorta there was no false-lumen thrombus, no coronary obstruction, and no pericardial effusion, and the patient remained hemodynamically stable. Based on the CT finding shown together with the level at which it occurs, what does the active contrast opacification of the false lumen at the aortic root/sinus level (rather than only more distally in the ascending aorta) imply about the location of the intimal entry tear, and how should that inference change the treatment approach compared with a scenario in which the tear were confined to the ascending aorta beyond the valve's distal edge?\nCase: An elderly woman underwent TAVI with a self-expandable valve for severe calcified aortic stenosis. During deployment, the partially expanded valve popped out with antegrade flow, was recaptured, and was redeployed slightly deeper. Transesophageal echocardiography showed a mobile ascending-aortic flap, but valve-frame shadowing obscured the aortic root, so contrast CT was obtained. She remained stable, with no coronary obstruction or pericardial effusion.\n\nImage: Axial contrast CT at the aortic root/sinus level. The white-rimmed circle labeled T is the true lumen containing the valve stent. The upper arrow marks hematoma and the lower arrow active contrast opacification within the surrounding false lumen at the same level.\n\nQuestion: What does false-lumen contrast at the root/sinus level imply about the intimal entry tear? Explain the associated risks and compare the required treatment with management of a tear confined to the ascending aorta beyond the valve's distal edge."},{"id":"q01-c5436d64bd689501","specialty":"Gastroenterology / Infectious Disease","type":"Investigation Interpretation","month":"2026-06","claude_score":2,"gemini_score":2.0,"title":"Severe hypereosinophilia secondary to intestinal whipworm infection with negative stool tests: a case report","image_count":1,"has_response":false,"search_text":"A man presented with about 2 months of watery diarrhea (5-10 loose stools per day) with intermittent mid-lower abdominal pain, and marked peripheral eosinophilia (absolute eosinophil count 11.56 x 10^9/L, 70% of leukocytes; hemoglobin and platelets normal). Three separate stool specimens, examined by a trained parasitology technician using direct smear and saline floatation, showed no ova; fecal occult blood was weakly positive in all three. An initial colonoscopy performed elsewhere was unremarkable, and gastroscopy on this admission showed only chronic non-atrophic gastritis; abdominal ultrasound was normal. The provided image is a still from a repeat colonoscopy near the ileocecal valve in this same patient (the arrow marks the finding of interest, which was alive and motile at the time of the procedure). Based on the appearance and location of the marked structure, identify the specific organism most likely responsible for this presentation, and state the general category of pathogen it belongs to.\nCase: A man had 2 months of watery diarrhea, with 5–10 loose stools daily, and intermittent mid-lower abdominal pain. His absolute eosinophil count was 11.56 × 10^9/L, representing 70% of leukocytes. Hemoglobin and platelet levels were normal.\n\nThree stool specimens were examined by a trained parasitology technician using direct smear and saline flotation. No ova were found. Fecal occult blood was weakly positive in all three specimens.\n\nAn earlier colonoscopy was unremarkable. Gastroscopy showed only chronic non-atrophic gastritis, and abdominal ultrasound was normal.\n\nImages: The image is from a repeat colonoscopy near the ileocecal valve. The arrow marks a structure that was alive and motile during the procedure.\n\nQuestion: What organism is shown, and what general pathogen category does it belong to?"},{"id":"q01-c8804d811e240d22","specialty":"Radiology/Hepatobiliary Oncology","type":"Diagnosis","month":"2026-04","claude_score":2.0,"gemini_score":2.0,"title":"Primary Multifocal Hepatic Gastrointestinal Stromal Tumor Mimicking Metastatic Disease: A Diagnostic Challenge With PET-CT and Histopathological Correlation","image_count":1,"has_response":false,"search_text":"A 62-year-old man with chronic alcohol use presents with weight loss and generalized weakness. Labs show markedly elevated alkaline phosphatase (375 IU/L, reference 40-129), mildly elevated AST/ALT, but normal CEA, CA19-9, and alpha-fetoprotein. The provided image shows four axial contrast-enhanced CT panels through the liver at the same level: plain (top-left), arterial phase (top-right), venous phase (bottom-left), and delayed phase (bottom-right), with red arrows marking the same well-defined, lobulated, rounded hepatic lesions across phases. Separately, MRI showed these hepatic lesions to be T2-hyperintense/T1-hypointense with peripheral and septal diffusion restriction and only subtle peripheral/septal post-contrast enhancement, without vascular invasion, ascites, or significant lymphadenopathy. There was also circumferential enhancing wall thickening (13 mm) at the gastroesophageal junction that was FDG-avid on PET-CT but caused only mild luminal narrowing with preserved contrast passage and no upstream dilatation, fat stranding, or nodal disease; endoscopic biopsy of this junctional thickening showed only mild hyperplasia with no dysplasia or malignancy. Whole-body PET-CT showed FDG avidity confined to the hepatic lesions and the junctional thickening, with no other metabolically active sites. Based on the imaging pattern shown, the tumor marker profile, and the biopsy findings at the gastroesophageal junction, what is the most likely origin of the multiple hepatic lesions, and why does this pattern argue against metastatic spread from an upper gastrointestinal primary?\nCase: A 62-year-old man with chronic alcohol use presents with weight loss and generalized weakness. Alkaline phosphatase is 375 IU/L (reference 40–129), AST and ALT are mildly elevated, and CEA, CA19-9, and alpha-fetoprotein are normal. MRI shows multiple well-defined lobulated hepatic lesions that are T2-hyperintense and T1-hypointense, with peripheral and septal diffusion restriction and only subtle peripheral/septal enhancement. There is no vascular invasion, ascites, or significant lymphadenopathy.\n\nA 13 mm circumferential enhancing thickening at the gastroesophageal junction is FDG-avid but causes only mild narrowing, with preserved contrast passage and no upstream dilatation, fat stranding, or nodal disease. Endoscopic biopsy shows mild hyperplasia without dysplasia or malignancy. Whole-body PET-CT shows FDG uptake only in the hepatic lesions and junctional thickening.\n\nImages: Axial liver CT at one level: plain (top-left), arterial (top-right), venous (bottom-left), and delayed (bottom-right). Red arrows mark the same rounded hepatic lesions across phases.\n\nQuestion: What is the most likely origin of the multiple hepatic lesions, and why do their imaging pattern, normal tumor markers, and benign gastroesophageal-junction biopsy argue against metastases from an upper gastrointestinal primary?"},{"id":"q01-cdb64fa3c0fb8a67","specialty":"Pulmonology / Thoracic Radiology","type":"Mechanism","month":"2026-05","claude_score":2.0,"gemini_score":2.0,"title":"Pulmonary Embolism Associated With Pneumomediastinum and Pneumoperitoneum After Laparoscopic Myomectomy: A Case Report and Literature Review","image_count":2,"has_response":false,"search_text":"A woman underwent an uneventful ~65-minute laparoscopic gynecologic procedure using CO2 pneumoperitoneum (insufflation 18-20 mmHg, intra-abdominal pressure maintained at 12 mmHg). Two hours after surgery she developed sudden severe dyspnea with a significant drop in oxygen saturation, without chest pain or fever. CT imaging obtained at that time showed three findings together: free gas in the mediastinum, free gas in the peritoneal cavity, and a filling defect in a pulmonary artery branch on CT angiography (a segmental/subsegmental pulmonary embolism). The provided images are from that same CT angiography study: the left image is an axial chest CT slice showing the mediastinal gas finding (arrows), and the right image is an axial CT angiography slice from the same study showing the pulmonary arterial filling defect (arrow). Repeat CT and laboratory work-up over the following days showed no diaphragmatic defect or other structural lesion to explain gas tracking from the abdomen into the chest, no venous thrombus on lower-limb duplex ultrasound or abdominal CT, a normal echocardiogram and ECG, and a completely negative thrombophilia/antiphospholipid panel; the only abnormal laboratory value was an elevated D-dimer. Propose a plausible pathophysiological mechanism, other than a classic deep-vein-thrombosis embolic source, that could mechanistically link the gas findings shown in the left image to the arterial filling defect shown in the right image, and explain why the absence of a demonstrable venous thrombus source supports this alternative mechanism.\nCase: A woman undergoes an uneventful 65-minute laparoscopic gynecologic procedure with CO₂ pneumoperitoneum (insufflation 18–20 mmHg; maintained intra-abdominal pressure 12 mmHg). Two hours later, she develops sudden severe dyspnea and oxygen desaturation without chest pain or fever. CT shows pneumomediastinum, pneumoperitoneum, and a segmental/subsegmental pulmonary arterial filling defect.\n\nFollow-up evaluation finds no diaphragmatic defect or other structural route for gas migration, no venous thrombus on lower-limb duplex or abdominal CT, normal echocardiography and ECG, and a negative thrombophilia/antiphospholipid panel. Only D-dimer is elevated.\n\nImages: The first axial chest CT shows mediastinal gas at the arrows. The second axial CT angiogram from the same study shows the pulmonary arterial filling defect at the arrow.\n\nQuestion: What plausible mechanism could link the postoperative gas accumulation to the pulmonary arterial filling defect without a classic lower-limb DVT source, and why does the negative venous-thrombosis and thrombophilia work-up support that mechanism?"},{"id":"q01-d78e70667976f4b0","specialty":"Pediatric Gastroenterology","type":"Diagnosis","month":"2026-04","claude_score":2,"gemini_score":2.0,"title":"Ischemic colitis in a child: a case report and narrative review","image_count":1,"has_response":false,"search_text":"A previously healthy young child was admitted for 6 days of small-volume, bright-red, odorless hematochezia with periumbilical/lower-abdominal discomfort. Labs: leukocytosis, positive fecal occult blood, markedly elevated antistreptolysin O (ASO) titer, but normal blood/stool cultures, normal ANA, anti-Saccharomyces cerevisiae antibody, and perinuclear ANCA. Abdominal ultrasound and contrast CT showed no colonic wall thickening, no reduced Doppler flow, no intramural gas, and no free fluid or perforation. Colonoscopy found segmental, patchy mucosal hyperemia and superficial erosions from the distal transverse colon through the rectum, with normal-appearing mucosa in the ascending colon (not pictured). Biopsies showed chronic active mucosal inflammation with lymphoplasmacytic infiltrate, crypt architectural distortion, and focal lymphoid aggregates, explicitly without granulomas, vasculitis, or ischemic necrosis. The provided image shows four endoscopic views from that colonoscopy, arranged in the same proximal-to-distal sequence as the tissue was sampled: top-left = distal transverse colon, top-right = descending colon, bottom-left = sigmoid colon, bottom-right = rectal mucosa. Empiric antimicrobial therapy given before and during admission did not improve symptoms. Based on the visual severity gradient across the four panels together with the pattern of skip lesions (normal ascending colon) and the negative infectious/autoimmune/structural workup, (1) identify which pictured segment shows the most severe mucosal injury, and (2) state the single most likely unifying diagnosis for this presentation.\nCase: A previously healthy young child has 6 days of small-volume, bright-red, odorless hematochezia with periumbilical and lower-abdominal discomfort. Tests show leukocytosis, fecal occult blood, and a markedly elevated antistreptolysin O titer. Blood and stool cultures, ANA, anti-Saccharomyces cerevisiae antibody, and p-ANCA are negative or normal. Ultrasound and contrast CT show no colonic wall thickening, reduced Doppler flow, intramural gas, free fluid, or perforation. Empiric antimicrobials do not improve the symptoms.\n\nColonoscopy shows segmental, patchy hyperemia and superficial erosions from the distal transverse colon through the rectum, with a normal ascending colon. Biopsies show chronic active mucosal inflammation, lymphoplasmacytic infiltrate, crypt distortion, and focal lymphoid aggregates, without granulomas, vasculitis, or ischemic necrosis.\n\nImages: Endoscopic views in proximal-to-distal sampling order: distal transverse colon (top-left), descending colon (top-right), sigmoid colon (bottom-left), and rectum (bottom-right).\n\nQuestion: Which pictured segment has the most severe mucosal injury, and what single diagnosis best unifies the visual severity gradient, skip pattern, treatment failure, and negative infectious, autoimmune, and structural work-up?"},{"id":"q01-f45b5be6eb0b128d","specialty":"Cardiology/Cardiothoracic Surgery","type":"Investigation Interpretation","month":"2026-04","claude_score":2,"gemini_score":2.0,"title":"Left Ventricular and Lung Perforation Caused by a Pacemaker Lead Requiring Emergency Surgical Repair in a Nonagenarian","image_count":1,"has_response":false,"search_text":"A man in his early 90s underwent dual-chamber pacemaker implantation via the subclavian vein for high-grade AV conduction disease. He was discharged clinically stable on day 1. Four days later he presented with worsening fatigue. The provided image shows two contrast-enhanced chest CT views obtained at that visit: left, an axial slice through the heart; right, a sagittal/coronal reconstruction through the left hemithorax. A radiopaque lead is marked by a yellow arrow in each view. No pericardial fluid collection is seen around the heart in either view. Based on the trajectory of the lead across these two views and the absence of pericardial fluid, (1) localize which cardiac chamber wall the lead has breached and describe the extracardiac structure it is extending toward, and (2) explain why the lack of a pericardial effusion on this imaging does not exclude a myocardial perforation in this scenario.\nCase: A man in his early 90s underwent dual-chamber pacemaker implantation through the subclavian vein for high-grade AV conduction disease. He was clinically stable at discharge on day 1. Four days later, he returned with worsening fatigue.\n\nImages: Contrast-enhanced chest CT was obtained at that visit. The left panel is an axial view through the heart. The right panel is a sagittal/coronal reconstruction through the left hemithorax. Yellow arrows mark the radiopaque lead. No pericardial fluid collection surrounds the heart.\n\nQuestion: Which cardiac chamber wall has the lead breached, and toward what extracardiac structure does it extend?"},{"id":"q02-52e5a103910d25b4","specialty":"Radiology / Gynecologic Pathology","type":"Mechanism","month":"2026-03","claude_score":2.0,"gemini_score":2.0,"title":"MRI Findings of Uterine Adenofibroma With Squamous Metaplasia","image_count":1,"has_response":true,"search_text":"In the same patient, pelvic examination showed a cystocele and ulceration of the vaginal wall attributed to long-standing pessary use. Histopathology of the resected endometrial-cavity mass showed epithelial components that were diffuse endometrial-type glands with widespread squamous metaplasia, sitting on a stroma that was largely replaced by fibrous tissue and lacked smooth-muscle components; the background endometrium separately showed surface erosion and inflammatory cell infiltration. The provided images show the same tumor during dynamic contrast-enhanced MRI: the left panel is the early phase and the right panel is the delayed phase (both sagittal plane, same tumor). On the early-phase image the solid tumor shows only weak, heterogeneous enhancement, whereas on the delayed-phase image the enhancement has progressively increased, concentrated along the tumor's papillary surface, while remaining less intense than the myometrium throughout. Using the histologic findings together with the enhancement pattern shown in the two images, explain the most plausible mechanism for why this tumor enhances weakly and heterogeneously at first but then shows progressively increasing enhancement that is concentrated at its papillary surface in the delayed phase, rather than the early, more uniform enhancement typical of a hypervascular tumor.\nCase: Pelvic examination showed a cystocele and vaginal-wall ulceration attributed to long-standing pessary use. Histopathology of the resected endometrial-cavity mass showed diffuse endometrial-type glands with widespread squamous metaplasia. The stroma was largely replaced by fibrous tissue and lacked smooth muscle. The background endometrium showed surface erosion and inflammatory cell infiltration.\n\nImages: Both panels are sagittal dynamic contrast-enhanced MRI images of the same tumor. The left panel (a) is the early phase, and the right panel (b) is the delayed phase. Early enhancement of the solid tumor is weak and heterogeneous. Delayed enhancement progressively increases and is concentrated along the papillary surface. Enhancement remains less intense than the myometrium throughout, unlike the early, more uniform enhancement typical of a hypervascular tumor.\n\nQuestion: What mechanism explains the tumor’s enhancement pattern?"},{"id":"q02-9c8ba09d8646dd3c","specialty":"Thoracic Pathology","type":"Investigation Interpretation","month":"2026-05","claude_score":2.0,"gemini_score":2.0,"title":"Targeted therapy combined with local consolidative surgery for oligometastatic stage IVA lung adenocarcinoma with CCDC6-RET fusion: a case report","image_count":1,"has_response":false,"search_text":"After several months of RET-targeted oral therapy for an oligometastatic RET fusion-positive lung adenocarcinoma, the primary lung nodule was surgically resected. The provided image shows hematoxylin-and-eosin-stained sections of the resected nodule at low magnification (left) and high magnification (right). Major pathological response (MPR) in this context is defined as 10% or less residual viable tumor cells in the resected specimen after preoperative systemic therapy. Based on the histologic appearance in the image, did this specimen achieve MPR? Identify the specific histologic feature(s) in the image that support your conclusion.\nCase: A patient with oligometastatic RET fusion-positive lung adenocarcinoma received several months of oral RET-targeted therapy. The primary lung nodule was then surgically resected. MPR after preoperative systemic therapy is defined as 10% or less residual viable tumor in the resected specimen.\n\nImages: The H&E-stained sections show the resected nodule at low magnification (left) and high magnification (right).\n\nQuestion: Based on the histology, did the specimen achieve MPR?"},{"id":"q01-6072d93f5434080b","specialty":"Hematology-Oncology / Infectious Disease","type":"Diagnosis","month":"2026-03","claude_score":2,"gemini_score":2.0,"title":"Kaposi Sarcoma Presenting as Hemophagocytic Lymphohistiocytosis Mimicking Infection and Lymphoma: A Diagnostic Challenge","image_count":0,"has_response":true,"search_text":"A woman with known hepatitis B carrier status and compensated cirrhosis was hospitalized for fever, a generalized rash, fatigue, bicytopenia (anemia and thrombocytopenia), and hepatosplenomegaly. Over several weeks, an extensive infectious work-up was negative or non-contributory: serologies for EBV, CMV, HIV, hepatitis C, hepatitis D, hepatitis E, brucellosis, leptospirosis, syphilis, and tuberculosis (IGRA) were all negative; Leishmania serology was only weakly positive on a dipstick screen and by indirect fluorescent antibody testing (low titer), but Leishmania PCR was negative, and infectious disease specialists judged this insufficient to explain her illness. Blood cultures grew organisms typical of skin flora/contaminants rather than a defined pathogen, and broad-spectrum antibiotics produced no improvement. A skin biopsy of the rash showed a pattern consistent with a drug reaction, not a specific systemic disease. A full autoimmune/rheumatologic panel (ANA, anti-dsDNA, ENA, ANCA, rheumatoid factor, anti-CCP, anticardiolipin) was entirely negative, and CT angiography showed no vasculitis. She fulfilled hemophagocytic lymphohistiocytosis (HLH) criteria (persistent fever, splenomegaly, bicytopenia, hyperferritinemia, hypofibrinogenemia/hypertriglyceridemia, and hemophagocytosis on bone marrow aspirate) and was started on etoposide plus dexamethasone. Bone marrow flow cytometry showed no clonal population, and a FISH panel on the marrow showed no rearrangement. Whole-body PET-CT showed diffuse hypermetabolic uptake in the spleen, liver, bone, and bilateral axillary lymph nodes. A core-needle (tru-cut) biopsy of the most accessible axillary lymph node was non-diagnostic, prompting a full excisional biopsy of that node. Based on this evidence, what category of underlying disease process is most likely driving this patient's secondary HLH, and what single piece of evidence most convincingly argues against each of the two most tempting alternative categories (an occult infection and a clonal lymphoid/hematologic malignancy)?\nCase: A woman with hepatitis B carrier status and compensated cirrhosis was hospitalized with fever, generalized rash, fatigue, anemia, thrombocytopenia, and hepatosplenomegaly. Tests for EBV, CMV, HIV, hepatitis C/D/E, brucellosis, leptospirosis, syphilis, and tuberculosis were negative. Leishmania serology was weakly positive at low titer, but PCR was negative and infectious disease specialists considered it insufficient. Blood cultures grew likely skin contaminants, and broad-spectrum antibiotics did not help. Skin biopsy favored a drug reaction. ANA, anti-dsDNA, ENA, ANCA, rheumatoid factor, anti-CCP, and anticardiolipin tests were negative, and CT angiography showed no vasculitis.\n\nShe met HLH criteria: persistent fever, splenomegaly, bicytopenia, hyperferritinemia, hypofibrinogenemia/hypertriglyceridemia, and marrow hemophagocytosis. Etoposide and dexamethasone were started. Bone marrow flow cytometry found no clonal population, and marrow FISH found no rearrangement. PET-CT showed diffuse hypermetabolic uptake in the spleen, liver, bone, and both axillary nodal regions. A core biopsy of an accessible axillary node was nondiagnostic, so the node was excised.\n\nQuestion: What category of underlying disease most likely caused this secondary HLH, and what single finding most strongly argues against each major alternative—occult infection and a clonal lymphoid/hematologic malignancy?"},{"id":"q01-8a12199c1c2bd9be","specialty":"Infectious Disease / Neurosurgery","type":"Investigation Interpretation","month":"2026-03","claude_score":2,"gemini_score":2.0,"title":"Management of Coccidioidal Meningitis Outside the Endemic Region","image_count":0,"has_response":true,"search_text":"A 44-year-old immunocompetent man developed subacute headache and hydrocephalus with extensive leptomeningeal enhancement on MRI. During workup, a mediastinal/paratracheal lymph node was biopsied. Histopathology of the lymph node showed abundant broad-based budding yeast forms. At the same time, serum antibody testing was positive for both of two dimorphic fungal genera. Empiric antifungal therapy was started based on the histopathology appearance. A dural biopsy performed about two weeks later during a drain revision was inflamed but showed no organisms and no growth on culture. Roughly ten days after the histopathology result, fungal culture of the original lymph node aspirate grew a specific organism, and immunodiffusion plus complement fixation serology confirmed antibodies specific to that same organism. Geographically, the patient lived in a region where a third, unrelated dimorphic fungus is the most locally prevalent cause of this kind of infection, and he had a history of transiting through a fungal-endemic region roughly two years before symptom onset. Based on the full evidence chain (not the histopathology appearance alone), what organism was the actual definitive cause of this patient's meningitis, and which single piece of evidence proved decisive over the initial histomorphologic impression?\nCase: A 44-year-old immunocompetent man developed subacute headache and hydrocephalus. MRI showed extensive leptomeningeal enhancement.\n\nA mediastinal/paratracheal lymph node biopsy showed abundant broad-based budding yeast. Serum antibody tests were positive for two dimorphic fungal genera. Empiric antifungal therapy was started based on the histopathologic appearance.\n\nAbout two weeks later, a dural biopsy obtained during drain revision showed inflammation but no organisms or culture growth. Roughly 10 days after the lymph-node histopathology result, fungal culture of the original aspirate grew a specific organism. Immunodiffusion and complement fixation confirmed antibodies specific to the cultured organism.\n\nThe patient lived where a third, unrelated dimorphic fungus was the most locally prevalent cause of this type of infection. He had also transited through a fungal-endemic region roughly two years before symptom onset.\n\nQuestion: What organism definitively caused the meningitis?"},{"id":"q02-65f4e09aec0ef3e0","specialty":"Dermatology","type":"Diagnosis","month":"2026-04","claude_score":2,"gemini_score":2.0,"title":"Hypopigmented Patches in an Adolescent: A Diagnostic Dilemma and the Value of Clinical Restraint","image_count":0,"has_response":false,"search_text":"In the same patient, the hypopigmented patches were first noticed on the face during infancy and gradually extended to involve the neck and trunk over years, without ever developing scale, itching, or surface change, and without any identifiable preceding rash, trauma, or infection at the affected sites. Two entities in the differential have defined natural histories: one classically causes fluctuating, subtly scaly, facial-predominant hypopigmentation often in atopic individuals, and the other classically arises specifically at the site of a prior inflammatory skin insult. Using the distribution/timing pattern and the absence of a triggering event as your two lines of evidence, explain why this patient's clinical course fits poorly with either of those two entities, and name the hypopigmenting condition that better fits a long-standing, slowly extending, scale-free course with no antecedent trigger.\nCase: Hypopigmented patches first appeared on the face during infancy. Over several years, they gradually spread to the neck and trunk. They never developed scale, itching, or surface changes. There was no preceding rash, trauma, or infection at the affected sites.\n\nOne differential diagnosis typically causes fluctuating, subtly scaly, facial-predominant hypopigmentation, often in atopic individuals. Another occurs specifically at the site of a prior inflammatory skin insult.\n\nQuestion: Which hypopigmenting diagnosis best fits this course?"},{"id":"q02-8ac2ea267b112ef1","specialty":"Uropathology/Oncology","type":"Diagnosis","month":"2026-04","claude_score":2.0,"gemini_score":2.0,"title":"Clinical Outcomes and Therapeutic Response in Adult TFE3-Related Renal Cell Carcinoma: A Case Series From a Tertiary Cancer Center in Southern India","image_count":0,"has_response":false,"search_text":"A young woman's renal mass showed, both grossly and on light microscopy, coarse brown-black pigment deposition, raising concern for a melanocytic mesenchymal renal tumor. Immunohistochemistry showed: strong diffuse nuclear positivity for a transcription factor associated with a Xp11.2 gene rearrangement; negativity for pan-cytokeratin, PAX8, and carbonic anhydrase IX; and positivity for the melanocytic markers HMB45 and Melan-A. Given this combined morphologic and immunophenotypic picture, which diagnosis should be favored - a melanotic variant of a translocation-associated renal cell carcinoma, or a perivascular epithelioid cell tumor (PEComa) - and which single piece of evidence is most responsible for tipping the diagnosis in that direction, despite the melanocytic marker positivity that is shared by both entities?\nCase: A young woman had a renal mass with coarse brown-black pigment on gross and light microscopic examination. The differential diagnosis was a melanotic variant of translocation-associated renal cell carcinoma or a perivascular epithelioid cell tumor (PEComa).\n\nImmunohistochemistry showed strong, diffuse nuclear staining for a transcription factor associated with an Xp11.2 gene rearrangement. Pan-cytokeratin, PAX8, and carbonic anhydrase IX were negative. HMB45 and Melan-A were positive, but both entities may express these melanocytic markers.\n\nQuestion: Which diagnosis is favored?"},{"id":"q02-d577e9d95b2cb905","specialty":"Tumor Immunology / Neurosurgical Oncology","type":"Mechanism","month":"2026-05","claude_score":2.0,"gemini_score":2.0,"title":"INI-1 Loss with brachyury positivity unmasking a cervical poorly differentiated chordoma initially diagnosed as epithelioid sarcoma: a case report","image_count":0,"has_response":false,"search_text":"In this same cervical paraspinal tumor (SMARCB1/INI-1 loss confirmed by immunohistochemistry, with the final diagnosis established via nuclear brachyury positivity), the tumor microenvironment showed dense infiltration by MPO-positive neutrophils and scattered CD68-positive histiocytes surrounding the tumor cells, but staining for a T-lymphocyte marker (CD3) was essentially negative throughout the tumor. SMARCB1/INI-1-deficient tumors are generally reported to derepress endogenous retroviral elements, producing an antiviral-like interferon response, and are typically described as having a CD8-rich T-lymphocyte infiltrate; chordomas overall have also been described as generally rich in T lymphocytes and macrophages, with significant neutrophil infiltration not consistently reported. Explain the mechanistic reasoning proposed to reconcile this tumor's neutrophil-dominant, T-lymphocyte-poor infiltrate with (1) the interferon-driven immune response expected from INI-1 loss and (2) the location-dependent immune heterogeneity described among chordomas, and state which functional neutrophil phenotype (pro-tumoral or anti-tumoral) this reasoning implicates.\nCase: A cervical paraspinal tumor showed SMARCB1/INI-1 loss by immunohistochemistry. Nuclear brachyury positivity established the final diagnosis.\n\nMPO staining showed dense neutrophil infiltration. Scattered CD68-positive histiocytes surrounded the tumor cells. CD3 staining for T lymphocytes was essentially negative throughout the tumor.\n\nSMARCB1/INI-1-deficient tumors are generally thought to derepress endogenous retroviral elements, producing an antiviral-like interferon response and a CD8-rich T-cell infiltrate. Chordomas are also usually described as rich in T lymphocytes and macrophages, without consistently significant neutrophil infiltration. However, chordoma immune profiles may vary by location.\n\nQuestion: What immunologic mechanism, including whether the neutrophils are pro- or anti-tumoral, explains this infiltrate?"},{"id":"q03-7488972e63c40172","specialty":"General Surgery / Gastroenterology","type":"Prognosis","month":"2026-04","claude_score":2.0,"gemini_score":2.0,"title":"CT-Negative Fish Bone Impaction in the Pyriform Sinus Requiring Operative Removal: A Case Report","image_count":0,"has_response":false,"search_text":"In cases of retained sharp, pointed fish-bone foreign bodies, quantify how the relative risk of complications changes when endoscopic retrieval is delayed beyond 24 hours after impaction, and separately when delayed beyond 48 hours. Also state the maximum recommended time window for esophagogastroduodenoscopy (EGD) evaluation after impaction of a sharp-pointed foreign body, and the reported incidence of esophageal perforation associated with such foreign bodies if evaluation/removal is not timely.\nContext: A sharp-pointed fish-bone foreign body remains impacted, and endoscopic retrieval is delayed.\n\nQuestion: How much does complication risk increase when retrieval is delayed beyond 24 hours and beyond 48 hours?"},{"id":"q03-8b708c30c78fbbd9","specialty":"Vascular Surgery / Interventional Radiology","type":"Mechanism","month":"2026-04","claude_score":2.0,"gemini_score":2.0,"title":"Beyond the Snare: Utilizing Rigid Laparoscopic Forceps for the Retrieval of a Wall-Embedded Inferior Vena Cava (IVC) Filter","image_count":0,"has_response":false,"search_text":"This filter had been in place for only about four months (119 days) when retrieval was attempted, yet standard snare, flexible forceps, and balloon techniques all failed because the hook and struts were firmly incorporated into the vessel wall — a degree of embedding more typically associated with implants left in place well over a year. Using the clinical history provided in this case (not general dwell-time statistics alone), propose the specific patient-level factor the case authors hypothesize may have accelerated this unusually rapid embedding, explain the biological mechanism they propose linking that factor to the observed wall changes, and state why they present this explanation as a hypothesis rather than an established cause.\nCase: A filter had been in place for only about four months (119 days) when retrieval was attempted. Standard snare, flexible forceps, and balloon techniques all failed because the hook and struts were firmly incorporated into the vessel wall. This degree of embedding is more typical of filters left in place for well over a year.\n\nQuestion: What patient-level factor might have accelerated this unusually rapid embedding?"},{"id":"q03-881a7c86cce4639c","specialty":"Plastic and Reconstructive Surgery / Orthopaedic Trauma Management","type":"Treatment","month":"2026-05","claude_score":2.5,"gemini_score":2.5,"title":"Anterior superior iliac spine fracture following DCIA free flap harvest: A two-case series and surgical recommendations","image_count":0,"has_response":false,"search_text":"This report describes managing iliac crest/ASIS fractures that occur after vascularized iliac crest bone flap harvest. According to the specific criteria the authors give for when open reduction and internal fixation (operative fixation) is required, versus when conservative (non-operative) management is appropriate, list the two circumstances that would mandate operative fixation, and explain why an isolated, non-displaced avulsion-type ASIS fracture discovered only after surgery, causing no major functional deficit and later showing radiographic healing, would meet neither of those circumstances.\nCase: After vascularized iliac crest bone flap harvest, an isolated, non-displaced avulsion-type ASIS fracture was discovered postoperatively. It caused no major functional deficit and later showed radiographic healing.\n\nQuestion: What are the authors’ two indications for operative fixation, and what management do they support for this fracture?"},{"id":"q01-3883cf2530c1ec9a","specialty":"Ophthalmology (Retina)","type":"Investigation Interpretation","month":"2026-06","claude_score":3.0,"gemini_score":0.0,"title":"Phacoemulsification in a highly myopic, single-seeing, post-vitrectomized eye with an anterior chamber phakic intraocular lens: a surgical challenge","image_count":1,"has_response":false,"search_text":"A man in his 50s has only one seeing eye; his fellow eye has no light perception from a retinal detachment repair that failed decades earlier. The seeing eye is highly myopic (refraction approximately -16.00 D) and has this surgical history, in order: (1) retinal detachment repaired with vitrectomy and scleral buckle; (2) later implantation of an iris-fixated anterior chamber phakic intraocular lens for high myopia; (3) still later, cataract surgery with explantation of that phakic lens and placement of a new intraocular lens in the capsular bag. About a year after the cataract surgery, this same eye developed a new retinal detachment, which was treated with repeat vitrectomy and gas tamponade. After the gas resorbed, the patient's visual acuity in this eye declined again (from 20/60 to 20/70). The provided image was obtained at this later time point: on the left, a fundus photograph of the eye; on the right, an optical coherence tomography (OCT) B-scan through the macula of the same eye, obtained in the same imaging session. Based on the imaging findings together with the clinical history, what is the most likely cause of this new visual decline, and what category of treatment would be indicated for it?\nCase: A man in his 50s has one seeing eye with high myopia (approximately −16.00 D). This eye previously underwent vitrectomy and scleral buckling for retinal detachment. An iris-fixated anterior chamber phakic intraocular lens was implanted later. It was removed during cataract surgery, and a new intraocular lens was placed in the capsular bag.\n\nAbout one year after cataract surgery, the eye developed another retinal detachment. It was treated with repeat vitrectomy and gas tamponade. After the gas resorbed, visual acuity declined from 20/60 to 20/70.\n\nImages: The left panel is a fundus photograph. The right panel is an OCT B-scan through the macula of the same eye from the same imaging session.\n\nQuestion: What is the most likely cause of the new visual decline?"},{"id":"q01-42842b017d565e1c","specialty":"Child and Adolescent Psychiatry","type":"Mechanism","month":"2026-04","claude_score":3.0,"gemini_score":0.0,"title":"Electroconvulsive therapy in an adolescent with dissociative identity disorder and depression: a case report","image_count":2,"has_response":false,"search_text":"A 15-year-old female was hospitalized for two months of auditory hallucinations and repeated self-harm. She was diagnosed with dissociative identity disorder (three distinct identity states) and a severe major depressive episode with psychotic features, including command auditory hallucinations from a male voice telling her to die, and a delusional belief that her death would relieve her family of the financial burden of her care. She began a course of bilateral (bitemporal) electroconvulsive therapy (ECT) using a 1.0 ms pulse width, combined with sertraline and olanzapine. The provided images show the patient's own drawings of her identities: on the left, three separate figures she drew before treatment, each representing a different named identity state; on the right, a single figure she drew after only 2 ECT sessions, by which point she no longer reported multiple identities and her mood had subjectively improved. Despite this early integration of her identities, her command auditory hallucinations and her delusional guilt about the family's finances persisted and required 10 additional ECT sessions (12 total) combined with continued medication before resolving. Based on this differential time course and the visual evidence of identity integration, what does the dissociation between rapid resolution of her multiple-identity symptoms and the delayed resolution of her hallucinations/delusions suggest about the likely mechanistic origin of her psychotic symptoms, and why does this matter for how her ongoing treatment should be approached?\nCase: A 15-year-old girl with repeated self-harm had 2 months of auditory hallucinations. She was diagnosed with dissociative identity disorder (three identity states) and severe major depression with psychotic features: a male voice commanded her to die, and she believed her death would reduce her family's financial burden. She received bitemporal ECT with sertraline and olanzapine.\n\nImages: Her pretreatment drawing (first image) shows three figures representing her identities. After 2 ECT sessions, her drawing (second image) shows one figure; she no longer reported multiple identities and her mood had improved. However, the hallucinations and financial delusion persisted until 10 more ECT sessions were given (12 total) with continued medication.\n\nQuestion: What does this difference in response time suggest about the mechanistic origin of her psychotic symptoms, and how should it affect ongoing monitoring and treatment?"},{"id":"q01-4369a87bf15f37b2","specialty":"Pediatric Infectious Diseases / Clinical Microbiology","type":"Investigation Interpretation","month":"2026-04","claude_score":0.0,"gemini_score":3.0,"title":"Co-infection with macrolide-resistant and macrolide-susceptible\n                    <i>Bordetella pertussis</i>\n                    strains in an infant: a case report","image_count":1,"has_response":false,"search_text":"An infant with pertussis had a nasal swab sent for both direct molecular testing and bacterial culture. Direct Sanger sequencing of the 23S rRNA gene from swab DNA, and separately from two individual bacterial colonies isolated from that same swab, produced the chromatogram traces shown in the provided image (top: direct nasal-swab DNA; middle: colony type 1; bottom: colony type 2), all centered on the same nucleotide position (marked by an arrowhead) that determines macrolide-susceptibility genotype. Colony type 1 was later shown by antimicrobial susceptibility testing to be highly macrolide-resistant (MIC >256 µg/mL for erythromycin, azithromycin, and clarithromycin), while colony type 2 was macrolide-susceptible (MIC 0.023 µg/mL for the same three drugs); both colony types had similar trimethoprim-sulfamethoxazole MICs (about 0.125 µg/mL). Whole-genome sequencing and repeat-typing showed the two colony types belong to genetically distinct, unrelated bacterial lineages, ruling out in-host emergence of resistance from a single ancestral strain. Based on the relative heights of the two overlapping peaks at the marked position in the top (direct swab) trace, compared with the single peaks in the middle and bottom traces, which colony type was present in relatively greater abundance in the original clinical specimen, and what specific diagnostic pitfall does this peak-height pattern illustrate for detecting mixed macrolide-resistant/susceptible infections by direct sequencing of clinical specimens (without culture-based isolation of individual colonies)?\nCase: An infant with pertussis had a nasal swab tested by direct Sanger sequencing of the 23S rRNA gene and by culture. The same gene region was then sequenced from two individual colonies from that swab. Susceptibility testing showed that colony type 1 was highly resistant to erythromycin, azithromycin, and clarithromycin (MIC >256 µg/mL), whereas colony type 2 was susceptible to all three (MIC 0.023 µg/mL). Whole-genome sequencing and repeat typing showed that the colonies were genetically distinct, unrelated lineages rather than resistance arising within one strain in the patient.\n\nImage: Chromatograms centered on the same arrowhead-marked macrolide-susceptibility position: direct swab DNA (top), colony type 1 (middle), and colony type 2 (bottom). The top trace has two overlapping peaks; the colony traces each have one.\n\nQuestion: By matching the relative peak heights in the direct-swab trace to the colony traces, which colony type was more abundant in the specimen, and how can unequal strain abundance cause direct sequencing without colony isolation to miss a mixed resistant/susceptible infection?"},{"id":"q01-50f70cfc26951b3e","specialty":"Dermatology/Infectious Disease","type":"Diagnosis","month":"2026-06","claude_score":3,"gemini_score":0.0,"title":"Primary Syphilis Presenting as an Atypical Facial Chancre: Diagnostic Value of Extraoral Examination in Dental Practice","image_count":1,"has_response":false,"search_text":"A middle-aged man visits a dentist for a routine checkup with no complaints. He has no fever, weight loss, or other systemic symptoms, and intraoral examination is completely normal. During extraoral inspection, a solitary skin lesion measuring about 2 cm is found on his forehead; it is non-tender on palpation, and there is no palpable lymphadenopathy in the cervical, submandibular, preauricular, or occipital regions. A genital examination performed separately finds no lesion. The provided image shows a close-up of this forehead lesion. Based on the lesion's appearance in the image together with the absence of pain, systemic symptoms, and regional lymphadenopathy, what is the single most likely diagnosis for this lesion, and what specific feature seen in the image most strongly supports that diagnosis over a simple traumatic scab or an insect bite reaction?\nCase: A middle-aged man has no complaints during a routine dental checkup. He has no fever, weight loss, or other systemic symptoms. Intraoral examination is normal.\n\nExtraoral examination shows a solitary, non-tender, 2 cm lesion on his forehead. There is no palpable cervical, submandibular, preauricular, or occipital lymphadenopathy. Genital examination shows no lesion.\n\nImages: The supplied close-up shows the forehead lesion.\n\nQuestion: What is the single most likely diagnosis?"},{"id":"q01-55ea587e1ed2f1dc","specialty":"Cardio-oncology","type":"Mechanism","month":"2026-03","claude_score":3,"gemini_score":0.0,"title":"When Constriction Is Not Just the Pericardium: Extrinsic Cardiac Encasement by Thymic Squamous Cell Carcinoma","image_count":1,"has_response":true,"search_text":"A man in his late 50s with a history of thoracic radiotherapy for a mediastinal malignancy and a prior episode of severe COVID-19 complicated by pericarditis and pericardial tamponade presented, years later, with anasarca and exertional dyspnea. Echocardiography and right heart catheterization showed the classic hemodynamic signature of constrictive physiology: marked respirophasic reciprocal variation between mitral and tricuspid inflow velocities, a prominent ventricular septal bounce, and ventricular interdependence, with a preserved ejection fraction. Given his history of radiotherapy and post-viral pericarditis, he was treated empirically with a 4-month trial of high-dose corticosteroids plus colchicine for presumed inflammatory pericarditis. There was no improvement in symptoms or hemodynamics afterward. The provided image shows contrast-enhanced axial chest CT obtained around this time (left: level of the great vessels; right: level of the upper cardiac chambers). Based on the CT appearance together with the lack of response to the anti-inflammatory trial, what is the mechanism responsible for this patient's constrictive physiology, and why does this mechanism explain the treatment failure?\nCase: A man in his late 50s had received thoracic radiotherapy for a mediastinal malignancy. He also had severe COVID-19 complicated by pericarditis and pericardial tamponade.\n\nYears later, he presented with anasarca and exertional dyspnea. Echocardiography and right heart catheterization showed marked reciprocal respiratory variation in mitral and tricuspid inflow, a prominent septal bounce, and ventricular interdependence. His ejection fraction was preserved.\n\nHe received high-dose corticosteroids and colchicine for 4 months for presumed inflammatory pericarditis. His symptoms and hemodynamics did not improve.\n\nImages: Contrast-enhanced axial chest CT was obtained around this time. Panel A (left) is at the level of the great vessels. Panel B (right) is at the level of the upper cardiac chambers.\n\nQuestion: What mechanism explains both the constrictive physiology and the failure of anti-inflammatory treatment?"},{"id":"q01-75d4564f3a8d51b9","specialty":"Cardiology - Electrophysiology/Interventional Cardiology","type":"Investigation Interpretation","month":"2026-03","claude_score":0.0,"gemini_score":3.0,"title":"Electrocardiogram challenge: acute coronary occlusion in a ventricular paced rhythm diagnosed using Sgarbossa criteria","image_count":1,"has_response":true,"search_text":"The provided image is a 12-lead ECG recorded in a patient with a permanent pacemaker (ventricular paced rhythm) who presented with acute chest pain and hypotension. Using the original (unmodified) Sgarbossa criteria for diagnosing acute coronary occlusion in the setting of a paced or bundle-branch-block QRS morphology, identify the two distinct ECG findings visible on this tracing that each satisfy a different original Sgarbossa criterion. For each finding, state which criterion it fulfils and in which lead(s) it is seen.\nCase: A patient with a permanent pacemaker presents with acute chest pain and hypotension. The 12-lead ECG shows a ventricular paced rhythm.\n\nImages: Review the supplied ECG using the original, unmodified Sgarbossa criteria.\n\nQuestion: Which two ECG findings meet the criteria, where are they seen, and which criterion is absent?"},{"id":"q01-847acfdc4a65afea","specialty":"Trauma / General Surgery","type":"Investigation Interpretation","month":"2026-04","claude_score":3,"gemini_score":0.0,"title":"Management of Penetrating Thoracoabdominal Trauma in a Resource-Limited Setting: A Case Report","image_count":2,"has_response":false,"search_text":"The two images are intraoperative photographs of a retained impaling foreign body in a patient with penetrating thoracoabdominal trauma, taken before the object was removed (left: anterior view of the torso; right: lateral/oblique view of the same torso, showing the object's course into the body). On arrival, before any imaging or exploration, the patient was hemodynamically normal (shock index consistently <0.9) and only mildly hypoxic, with saturations fully correcting above 92% on supplemental oxygen. Using only the entry site and the angle/course of the object visible in the two images (plus knowledge of thoracoabdominal anatomy), name the specific abdominal organ(s) and the specific thoracic structures that are anatomically most likely to lie directly in the object's path, and justify each based on the trajectory shown.\nCase: Two intraoperative photographs show a retained impaling foreign body before removal in a patient with penetrating thoracoabdominal trauma. Before imaging or exploration, the shock index remained below 0.9. Mild hypoxia corrected to an oxygen saturation above 92% with supplemental oxygen.\n\nImages: Image 1 shows an anterior view of the torso. Image 2 shows a lateral/oblique view of the same torso and the object's course into the body.\n\nQuestion: Based only on the visible entry site, trajectory, and thoracoabdominal anatomy, which abdominal organs and thoracic structures lie in the object's path?"},{"id":"q01-8bd04b3cf34b3699","specialty":"Rheumatology / Dermatopathology","type":"Investigation Interpretation","month":"2026-03","claude_score":3,"gemini_score":0.0,"title":"Two case reports of eosinophilic fasciitis with onset after immune checkpoint inhibitor cessation","image_count":2,"has_response":true,"search_text":"Two adults were each diagnosed with the same fibrosing skin/subcutaneous disorder by full-thickness skin biopsy after developing symmetric limb edema, skin tightening, and a positive \"groove sign\" that spared the hands and feet. At the time of their diagnostic work-up, Patient A's peripheral blood eosinophil count was within the normal range, whereas Patient B's peripheral blood eosinophil count was clearly elevated (about twice the upper limit of normal). The provided images are high-power H&E fields taken from each patient's diagnostic biopsy: the left image is from one patient and the right image is from the other patient (the left/right order does not indicate which is which). Based on the cellular infiltrate visible in each image, state which image (left or right) belongs to Patient B, and explain what this pairing implies about the relationship between peripheral blood eosinophil count and tissue eosinophil infiltration in this disorder.\nCase: Two adults had the same fibrosing skin and subcutaneous disorder confirmed by full-thickness skin biopsy. Both developed symmetric limb edema and skin tightening, with a positive groove sign and sparing of the hands and feet. Patient A had a normal peripheral blood eosinophil count at diagnostic work-up. Patient B had a clearly elevated count, about twice the upper limit of normal.\n\nImages: The left and right images are high-power H&E fields from the patients’ diagnostic biopsies. Their order does not indicate the patient assignment.\n\nQuestion: Which image belongs to each patient, and what does the pairing imply about peripheral blood and tissue eosinophils?"},{"id":"q02-7c5576dd21b03242","specialty":"Orthopedic Surgery","type":"Mechanism","month":"2026-05","claude_score":0.0,"gemini_score":3.0,"title":"Patellar Reconstruction During Total Knee Arthroplasty for Previous Patellectomy","image_count":1,"has_response":false,"search_text":"During robotic-arm-assisted knee replacement with autograft patellar reconstruction, the surgical team corrected the knee's coronal and rotational malalignment to neutral, centralized the autograft ('neopatella') in the trochlear groove using intraoperative tracking, and performed an advancement of the vastus medialis muscle to improve the pull direction of the extensor mechanism. Two years after surgery the patient was free of anterior knee pain with an active flexion range of 0-125 degrees. The provided skyline-view radiograph was obtained at this follow-up. Given that bony coronal/rotational alignment and autograft centering had already been achieved intraoperatively, what does the appearance of the reconstructed patella relative to the trochlear groove in this image most likely indicate about the patient's extensor mechanism, and why was a surgical approach that could have allowed a more thorough lateral soft-tissue release not used instead of the muscle advancement that was performed?\nCase: During robotic-arm-assisted knee replacement with autograft patellar reconstruction, the knee’s coronal and rotational alignment was corrected to neutral. Intraoperative tracking confirmed that the autograft (“neopatella”) was centered in the trochlear groove. The vastus medialis was advanced to improve the extensor mechanism’s pull direction.\n\nAt 2-year follow-up, the patient had no anterior knee pain and active knee motion from 0° to 125°.\n\nImages: The supplied image is the skyline-view radiograph from this follow-up.\n\nQuestion: What does the reconstructed patella’s position relative to the trochlear groove indicate about the extensor mechanism?"},{"id":"q01-2514a9b136586539","specialty":"Pediatric Hematology / Clinical Pharmacology","type":"Investigation Interpretation","month":"2026-07","claude_score":0.0,"gemini_score":3.0,"title":"Concizumab prophylaxis in a 2-year-old patient with severe hemophilia B and inhibitor: a case report","image_count":0,"has_response":false,"search_text":"A young child with severe factor IX (FIX) deficiency and a low-titer FIX inhibitor was started on a subcutaneous anti-TFPI antibody for hemostatic prophylaxis, given as a loading dose followed by a daily maintenance dose. Trough drug concentrations were drawn immediately before the next scheduled dose, after allowing time to reach steady state. At a maintenance dose of 0.2 mg/kg/day, the trough level was subtherapeutic (<122.63 ng/mL). The dose was raised to 0.25 mg/kg/day, and the new steady-state trough was 153.24 ng/mL — still below the drug's 200 ng/mL efficacy threshold. The dose was then raised again, by only 0.05 mg/kg/day, to 0.3 mg/kg/day, and the resulting steady-state trough rose to 2909.9 ng/mL (within the target range of 200-4000 ng/mL). The child weighed about 14.4 kg and was actively growing/gaining weight across this dose-escalation period. Explain the pharmacokinetic mechanism that best accounts for why this last, proportionally modest dose increase produced such a disproportionately large rise in steady-state drug concentration, rather than a roughly proportional increase.\nCase: A young child with severe factor IX deficiency and a low-titer FIX inhibitor received a subcutaneous anti-TFPI antibody for hemostatic prophylaxis. Treatment began with a loading dose, followed by daily maintenance dosing. Steady-state trough concentrations were measured immediately before the next scheduled dose.\n\nAt 0.2 mg/kg/day, the trough concentration was subtherapeutic (<122.63 ng/mL). At 0.25 mg/kg/day, it was 153.24 ng/mL, below the 200 ng/mL efficacy threshold. Increasing the dose to 0.3 mg/kg/day raised it to 2909.9 ng/mL, within the 200–4000 ng/mL target range.\n\nThe child weighed about 14.4 kg and was actively growing and gaining weight during dose escalation.\n\nQuestion: What pharmacokinetic mechanism explains the disproportionate rise in the steady-state trough concentration?"},{"id":"q01-2bf9320c0f5eeb2f","specialty":"Pediatric Immunology/Medical Genetics","type":"Mechanism","month":"2026-03","claude_score":0.0,"gemini_score":3.0,"title":"Five children with haploinsufficiency of A20 caused by heterozygous mutations in the TNFAIP3 gene","image_count":0,"has_response":true,"search_text":"In a case series of children with heterozygous loss-of-function variants in the NF-kB regulator gene A20 (TNFAIP3), one child's genetic testing showed something different from the others: instead of a small frameshift or nonsense change confined to TNFAIP3 itself, this child carried a large heterozygous deletion of about 2.1 Mb at chromosome 6q23 that removed the entire TNFAIP3 gene together with three flanking genes - a peroxisomal matrix-protein import receptor gene (complete loss of this gene classically causes a skeletal chondrodysplasia with punctate epiphyseal calcification), and two interleukin-receptor genes important for skin and mucosal immune regulation. This child presented with recurrent fever, colonic ulcers, oral and genital ulcers, a skin rash, and joint inflammation (arthritis). Four other unrelated children in the same series carried only small frameshift or nonsense variants confined to either the A20 protein's N-terminal (OTU) domain or its C-terminal zinc-finger domains - none of the three flanking genes were affected in any of them. All four presented with recurrent fever and gastrointestinal and/or oral ulcers, but none of the four developed arthritis or any joint disease. Explain, mechanistically, why the child with the large segmental deletion developed arthritis while the four children with isolated TNFAIP3 domain variants did not, and identify which specific co-deleted gene most plausibly drives the joint disease (as distinct from A20/NF-kB dysregulation).\nCase: In children with heterozygous loss-of-function variants in the NF-kB regulator A20 (TNFAIP3), one child had a ~2.1-Mb deletion at 6q23. It removed TNFAIP3 plus a peroxisomal matrix-protein import receptor gene—whose complete loss classically causes skeletal chondrodysplasia with punctate epiphyseal calcification—and two interleukin-receptor genes involved in skin and mucosal immunity. This child had recurrent fever, colonic and oral/genital ulcers, rash, and arthritis.\n\nFour other children had small frameshift or nonsense variants confined to the A20 OTU or zinc-finger domains, with none of the flanking genes affected. They had recurrent fever and gastrointestinal and/or oral ulcers but no arthritis or other joint disease.\n\nQuestion: Which co-deleted gene most plausibly caused the arthritis, how is its mechanism distinct from A20/NF-kB dysregulation, and why did the four children with isolated TNFAIP3 variants lack joint disease? Contrast the likely joint effect with the skin/mucosal role of the co-deleted interleukin-receptor genes."},{"id":"q01-98b7f71aeb58bf6d","specialty":"General/Emergency Surgery","type":"Mechanism","month":"2026-05","claude_score":3,"gemini_score":0.0,"title":"Ileo-Ileal Knotting Presenting as Strangulated Small Bowel Obstruction: An Uncommon Surgical Catastrophe","image_count":0,"has_response":false,"search_text":"An elderly man (late 70s) with no prior abdominal surgery presented after about 12 hours of severe, continuous, diffuse abdominal pain, progressive distension, bilious vomiting, and absence of flatus/stool. He had no fever; exam showed diffuse tenderness with guarding (suggesting evolving peritoneal irritation) and absent bowel sounds, but no palpable mass and no external (e.g., inguinal) hernia. Labs showed leukocytosis (WBC 18x10^9/L; normal ~4-11) and only mildly elevated lactate (2.1 mmol/L; normal ~0.5-2.0). Contrast-enhanced CT showed dilated proximal small bowel loops with a sharp transition point in the mid-ileum, and the bowel distal to this transition showed reduced wall enhancement (30-40 HU) compared with proximal, non-dilated loops (>60 HU), plus surrounding mesenteric fat stranding and a small amount of pelvic free fluid (~15 HU) — a pattern read as closed-loop obstruction with early ischemic change, though no definite twisted/whorled bowel configuration could be identified on the scan. Given a virgin abdomen (no adhesion risk), no external or internal hernia, and this closed-loop physiology in an elderly patient, what specific intraoperative pathology best explains this presentation, and by what mechanism does it produce bowel strangulation?\nCase: A man in his late 70s with no previous abdominal surgery presented after 12 hours of severe, continuous, diffuse abdominal pain. He had progressive abdominal distension, bilious vomiting, and no passage of flatus or stool.\n\nHe was afebrile. Examination showed diffuse tenderness, guarding, and absent bowel sounds. There was no palpable mass or external hernia.\n\nThe leukocyte count was 18 × 10^9/L. Lactate was only mildly elevated at 2.1 mmol/L.\n\nContrast-enhanced CT showed dilated proximal small-bowel loops with a sharp transition point in the mid-ileum. The bowel wall distal to the transition enhanced at 30–40 HU, compared with more than 60 HU in proximal non-dilated loops. There was surrounding mesenteric fat stranding and a small amount of pelvic free fluid measuring about 15 HU. The findings indicated a closed-loop obstruction with early ischemic change. No internal hernia or definite twisted or whorled bowel configuration was identified.\n\nQuestion: What specific intraoperative mechanism explains the obstruction and strangulation?"},{"id":"q02-039c1e30bd69e5e0","specialty":"Toxicology / Neuromuscular Pharmacology","type":"Mechanism","month":"2026-05","claude_score":0.0,"gemini_score":3.0,"title":"Iatrogenic botulinum Toxin Type A poisoning with persistent unilateral vocal cord paralysis: a case report and clinical implications","image_count":0,"has_response":false,"search_text":"A patient received simultaneous bilateral intramuscular masseter injections of an illicit botulinum toxin type A product (equal dose on each side). Within a day she developed grossly symmetric systemic features consistent with descending flaccid paralysis (bilateral ptosis, dysphagia, dysarthria, and limb weakness), yet when a focal laryngeal complication later emerged, it involved only one vocal cord, with no comparable dysfunction on the opposite side. Explain why a toxin dose delivered symmetrically to both sides of the face produced roughly symmetric systemic neuromuscular signs but caused a distinctly asymmetric, unilateral laryngeal injury.\nCase: A patient received simultaneous bilateral masseter injections of an illicit botulinum toxin type A product, with equal doses on each side. Within one day, she developed grossly symmetric descending flaccid paralysis, including bilateral ptosis, dysphagia, dysarthria, and limb weakness. A later laryngeal complication affected only one vocal cord, without comparable dysfunction on the opposite side.\n\nQuestion: What mechanisms explain the symmetric systemic signs and unilateral vocal cord complication?"},{"id":"q02-4870e2ad853dd38e","specialty":"Infectious Disease/Neurology","type":"Investigation Interpretation","month":"2026-05","claude_score":0.0,"gemini_score":3.0,"title":"Ischemic Stroke Secondary to Meningovascular Syphilis","image_count":0,"has_response":false,"search_text":"In this same patient, serum treponemal IgG/IgM antibody testing was reactive with an RPR titer of 1:512, and lumbar puncture yielded CSF with WBC 47 cells/µL (lymphocyte predominant), protein 398 mg/dL, and glucose 32 mg/dL. Treponemal antibody assays are highly sensitive but have a recognized limitation: their specificity for confirming true CNS infection is reduced because antibody can passively cross an intact blood-brain barrier and appear in CSF even without neuroinvasion. Given this limitation, which single CSF-based test would be needed to specifically confirm intrathecal (true CNS) infection rather than passive antibody diffusion, and what physical property of the molecule it detects is responsible for its high specificity?\nCase: In this patient, serum treponemal IgG/IgM antibodies were reactive, with an RPR titer of 1:512. CSF contained 47 WBC/µL with lymphocyte predominance, protein 398 mg/dL, and glucose 32 mg/dL. Treponemal antibodies can passively cross an intact blood-brain barrier, reducing the specificity of CSF treponemal assays for true CNS infection.\n\nQuestion: Which CSF test confirms intrathecal infection, and what physical property of its detected molecule makes the test highly specific?"},{"id":"q02-596a210a26f63443","specialty":"Transplant Immunology","type":"Mechanism","month":"2026-04","claude_score":3.0,"gemini_score":0.0,"title":"Tonsillar Post-transplant Lymphoproliferative Disorder Presenting With Hemoptysis After Heart Transplantation: A Case Report and Review of the Literature","image_count":0,"has_response":false,"search_text":"A heart-transplant recipient maintained on tacrolimus and mycophenolic acid was found to have active, concurrent Epstein-Barr virus (EBV) and cytomegalovirus (CMV) infection at the time he developed progressive tonsillar lymphoproliferation that was ultimately diagnosed as post-transplant lymphoproliferative disorder (PTLD). Beyond the shared effect of pharmacologic immunosuppression, describe the specific immunologic mechanism by which concurrent CMV infection is thought to increase the risk that EBV-driven B-cell proliferation progresses to PTLD.\nCase: A heart-transplant recipient was taking tacrolimus and mycophenolic acid. He developed progressive tonsillar lymphoproliferation and was ultimately diagnosed with post-transplant lymphoproliferative disorder (PTLD). EBV and CMV infections were both active at the time.\n\nQuestion: Beyond pharmacologic immunosuppression, what immunologic mechanism links concurrent CMV infection to progression of EBV-driven B-cell proliferation to PTLD?"},{"id":"q02-a06fc4706496152d","specialty":"Vascular Surgery / Reconstructive Microsurgery","type":"Mechanism","month":"2026-04","claude_score":3.0,"gemini_score":0.0,"title":"Functional Limb Preservation after Surgical Distal Venous Arterialization with Free Flap in Chronic Limb-Threatening Ischemia with Severe Foot Arterial Disease","image_count":0,"has_response":false,"search_text":"In a patient with a large foot soft-tissue defect after debridement, a free muscle flap was transferred to close the wound. During the flap transfer, the flap's own artery was joined end-to-side onto the previously created venous arterialization graft (a vein graft carrying retrograde arterial-type flow into the foot), and the flap's own vein was joined end-to-end to the native posterior tibial vein that had originally served as the arterialization outflow. Years later, follow-up angiography showed that the original venous arterialization graft had become occluded, yet the flap's arterial inflow vessel was still shown to be carrying flow and acting as a runoff pathway, and the limb remained free of new tissue loss. Explain the vascular mechanism by which the transferred flap was able to keep sustaining tissue perfusion in the foot after the original arterialization graft itself stopped functioning.\nCase: A large foot soft-tissue defect remained after debridement and was covered with a free muscle flap. The flap artery was connected end-to-side to a venous arterialization graft carrying retrograde arterial-type flow into the foot. The flap vein was connected end-to-end to the native posterior tibial vein, which had served as the arterialization outflow.\n\nYears later, angiography showed occlusion of the original venous arterialization graft. However, the flap’s arterial inflow vessel still carried flow and served as a runoff pathway. The limb developed no new tissue loss.\n\nQuestion: What vascular mechanism allowed the flap to sustain foot perfusion after the arterialization graft occluded?"},{"id":"q03-399aa651454b7bca","specialty":"Ophthalmology (Glaucoma Surgery)","type":"Treatment","month":"2026-05","claude_score":0.0,"gemini_score":3.0,"title":"Sequential Surgical Management of Refractory Primary Angle-Closure Glaucoma in a Functionally Monocular Patient","image_count":0,"has_response":false,"search_text":"When a glaucoma drainage (Ahmed) valve was implanted in this functionally monocular eye, the surgical team placed the tube in the anterior chamber angle rather than the ciliary sulcus, even though both locations are known to lower IOP to a similar degree. By this point the eye had already undergone lens extraction, an anterior (pars plana) vitrectomy, and posterior capsulotomy, and had previously suffered a postoperative hyphema and a separate spontaneous vitreous hemorrhage. Given this history, state the two eye-specific factors that favored anterior chamber tube placement over ciliary sulcus placement.\nCase: A functionally monocular eye underwent Ahmed glaucoma valve implantation. Anterior chamber angle and ciliary sulcus placement were expected to lower IOP similarly.\n\nBefore implantation, the eye had undergone lens extraction, anterior (pars plana) vitrectomy, and posterior capsulotomy. It had also developed postoperative hyphema and, separately, spontaneous vitreous hemorrhage.\n\nQuestion: Which two eye-specific factors favored anterior chamber tube placement over ciliary sulcus placement?"},{"id":"q03-b0b72ee80c5cf47a","specialty":"Neurointerventional Radiology","type":"Treatment","month":"2026-04","claude_score":3.0,"gemini_score":0.0,"title":"Sensorineural Hearing Loss After Transvenous Embolization of a Transverse-Sigmoid Sinus Dural Arteriovenous Fistula","image_count":0,"has_response":false,"search_text":"To treat the fistula, the interventional team accessed the abnormal draining sinus, which was itself occluded (isolated) and therefore not filled with visible contrast at that step, via a catheter advanced from the internal jugular vein. They then had to perforate through this occluded segment with a guidewire under fluoroscopic (X-ray) guidance before a microcatheter could be advanced for coil placement. Since the target sinus could not be seen directly as a contrast-filled channel during this maneuver, what alternative anatomical reference did the operators use on fluoroscopy to guide safe perforation of the occluded sinus, and why was this reference available in this particular patient?\nCase: To treat a fistula, the operators advanced a catheter from the internal jugular vein toward the abnormal draining sinus. The target sinus was occluded and did not fill with contrast. Under fluoroscopic guidance, they perforated the occluded segment with a guidewire. They then advanced a microcatheter for coil placement.\n\nQuestion: What anatomical reference guided safe perforation of the non-opacified sinus?"},{"id":"q03-e334595177c4a9e0","specialty":"Neurology/Dermatology","type":"Complication","month":"2026-04","claude_score":3,"gemini_score":0.0,"title":"Successful Treatment of Refractory Palmoplantar Pustulosis With Bimekizumab in a Patient With Multiple Sclerosis: A Case Report","image_count":0,"has_response":false,"search_text":"This patient had a well-controlled demyelinating autoimmune neurologic disease managed with a monoclonal antibody, alongside a longstanding pustular skin disease of the sole. During the workup, one prior systemic skin therapy was stopped specifically because it coincided with worsening joint pain and worsening of her neurologic disease, with improvement in both shortly after stopping it. Separately, when a dual-cytokine biologic was later chosen for her skin disease despite general caution about biologics in this neurologic condition, no neurologic worsening occurred over six weeks of treatment. Identify the systemic therapy that was linked to neurologic worsening, and explain the pharmacologic reasoning that supported choosing the dual-cytokine biologic as an acceptable option despite that general caution.\nCase: A patient had a well-controlled demyelinating autoimmune neurologic disease treated with a monoclonal antibody. She also had a longstanding pustular skin disease of the sole.\n\nA systemic skin therapy was stopped after her joint pain and neurologic disease worsened. Both improved shortly after the therapy was stopped. A dual-cytokine biologic was later used despite general caution about biologics in this neurologic condition. No neurologic worsening occurred during six weeks of treatment.\n\nQuestion: Which systemic skin therapy was associated with the worsening joint and neurologic symptoms?"},{"id":"q01-ba04892ce0e1c13c","specialty":"Hematology","type":"Mechanism","month":"2026-06","claude_score":3.0,"gemini_score":1.5,"title":"Case Report: Heparin resistance as the harbinger of heparin-induced thrombocytopenia in acute pulmonary embolism","image_count":1,"has_response":false,"search_text":"A 50-year-old man (weight 75 kg) with acute pulmonary embolism, deep vein thrombosis, and a mobile right ventricular mass was started on continuous IV unfractionated heparin (UFH) on day 0, titrated according to a weight-based nomogram to an individualized target APTT of 1.5-3.0 times his pre-treatment baseline (baseline APTT 33.2 s, giving a target range of about 50-100 s). Despite escalating the UFH infusion to a maximum of 1,850 U/h (~24.7 U/kg/h) - a dose well above conventional resistance thresholds - he had two episodes of hemodynamic instability with imaging-confirmed thrombus progression, on treatment days 3 and 6. He was then switched to intravenous argatroban, a direct thrombin inhibitor, started at a fixed dose of 2 micrograms/kg/min (not further escalated), also titrated to the same relative APTT target range using the same assay and analyzer. The provided image plots his measured APTT (seconds) against time (days); the medication being infused during each interval is labeled along the bottom of the plot (UFH, then argatroban, then rivaroxaban). Using the pattern shown in the image together with the clinical course described, explain the physiological mechanism that best accounts for (1) why APTT failed to rise into the target range during UFH dosing despite maximal weight-based escalation, and (2) why APTT rose promptly into a sustained target range as soon as argatroban was started at a comparatively low, fixed dose. Also state why this pattern is a meaningful diagnostic clue rather than simply a sign of heparin underdosing.\nCase: A 50-year-old, 75-kg man with pulmonary embolism, deep-vein thrombosis, and a mobile right-ventricular mass began continuous IV UFH on day 0. His baseline APTT was 33.2 s and target was about 50-100 s. Despite weight-based escalation to 1,850 U/h (~24.7 U/kg/h), he developed hemodynamic instability with imaging-confirmed thrombus progression on days 3 and 6. He was switched to fixed-dose IV argatroban, 2 micrograms/kg/min without escalation, using the same relative APTT target, assay, and analyzer.\n\nImage: The graph plots APTT by day and labels the UFH, argatroban, and rivaroxaban intervals. APTT was not consistently therapeutic during UFH but rose promptly and remained therapeutic after argatroban began.\n\nQuestion: What physiological mechanism explains the different APTT responses to maximally escalated UFH and low fixed-dose argatroban, and why is heparin resistance with progressive thrombosis an important diagnostic clue rather than simple underdosing?"},{"id":"q03-39db38193178b8e6","specialty":"Veterinary Neuroradiology","type":"Investigation Interpretation","month":"2026-04","claude_score":1.5,"gemini_score":3.0,"title":"Multicentric Round Cell Neoplasia with Plasmacytic Differentiation in a Cat with Systemic Progression: Multimodal Imaging and Treatment Response","image_count":1,"has_response":false,"search_text":"One month after completing radiotherapy to the abdominal mass, a cat with known multicentric round cell neoplasia at presumed lymph node stations developed acute-onset pelvic limb weakness. Restaging CT showed continued enlargement of most non-irradiated presumed lymph nodes and a new extradural mass at the T5 vertebral level causing spinal cord compression, with no associated osteolysis and no vertebral marrow signal alteration. The provided images are MRI of this new spinal mass at the same axial level: left panel, T2-weighted; right panel, T1-weighted (the arrow marks the mass in both). Describe the signal intensity of the mass relative to spinal cord gray matter on each sequence, and explain how this signal pattern, combined with the absence of vertebral bone/marrow change, helps distinguish between feline spinal lymphoma and a plasma-cell-lineage tumor as the more likely cause of this new lesion — while also explaining why imaging alone cannot make this distinction definitive.\nCase: A cat with multicentric round cell neoplasia at presumed lymph node stations developed sudden pelvic limb weakness one month after completing radiotherapy for an abdominal mass. Restaging CT showed continued enlargement of most non-irradiated presumed lymph nodes. It also showed a new extradural mass at T5 compressing the spinal cord, without osteolysis or vertebral marrow signal alteration. The differential is feline spinal lymphoma versus a plasma-cell-lineage tumor.\n\nImages: Axial MRI images show the mass at the same level. The left panel is T2-weighted, and the right panel is T1-weighted. The arrow marks the mass in each panel.\n\nQuestion: How do the T2 and T1 signals relative to cord gray matter and absent vertebral changes support and limit the lymphoma–plasma-cell differential?"},{"id":"q01-0a17e634ca714f1b","specialty":"Gynecologic Oncology/Radiology","type":"Investigation Interpretation","month":"2026-04","claude_score":3.0,"gemini_score":2.0,"title":"Silent giant: a 35-cm mucinous ovarian cystadenoma presenting as failure to lose weight","image_count":1,"has_response":false,"search_text":"A woman in her mid-40s presented with progressive abdominal enlargement and persistent inability to lose weight, but denied any abdominal pain, GI symptoms, or urinary complaints. Ultrasound showed a giant multiloculated cystic adnexal mass with predominantly anechoic content and some thickened septations but no definite solid nodules or vascularity. On the corresponding contrast-enhanced MRI sequence, the mass met imaging criteria for the highest-risk O-RADS category. Serum CA-125, CA 19-9, CA 15-3, AFP, CEA, and HE4 were all within normal limits. The provided image is one axial post-contrast MRI slice through this mass. Based on the imaging pattern visible in the image, what specific feature is most responsible for the high-risk O-RADS classification despite reassuring tumor markers, and what is the most likely final histologic category of this mass once this feature is accounted for?\nCase: A woman in her mid-40s presented with progressive abdominal enlargement and persistent inability to lose weight. She had no abdominal pain, gastrointestinal symptoms, or urinary complaints.\n\nUltrasound showed a giant multiloculated cystic adnexal mass. It had predominantly anechoic content and some thickened septations, without definite solid nodules or vascularity. On contrast-enhanced MRI, the mass met criteria for the highest-risk O-RADS category. Serum CA-125, CA 19-9, CA 15-3, AFP, CEA, and HE4 were within normal limits.\n\nImages: The provided image is an axial post-contrast MRI slice through the mass.\n\nQuestion: What imaging feature most likely accounts for the high-risk O-RADS classification?"},{"id":"q01-0c3fc04d16dafabf","specialty":"Gastroenterology/Oncology","type":"Investigation Interpretation","month":"2026-05","claude_score":3,"gemini_score":2.0,"title":"A Rare Case of Esophageal Small-Cell Neuroendocrine Carcinoma Presenting With Progressive Dysphagia","image_count":1,"has_response":false,"search_text":"An 85-year-old man was found to have a poorly differentiated small-cell neuroendocrine carcinoma of the mid-esophagus. Immunohistochemistry showed strong positivity for synaptophysin and INSM1 with a Ki-67 proliferation index approaching 100%, indicating an extremely high proliferative rate. Contrast-enhanced CT of the chest, abdomen, and pelvis showed esophageal wall thickening but no evidence of distant metastatic disease, and no pathologically enlarged lymph nodes were seen on either CT or endoscopic ultrasound (EUS). Endoscopy separately showed the mass to be a 6 cm ulcerated, fungating lesion involving about three-quarters of the esophageal circumference. The provided image is the endoscopic ultrasound cross-sectional view of this esophageal mass, with arrows marking the tumor's outer margins. Based on the wall layers visible in the image: (1) what is the deepest esophageal wall layer reached by the tumor's margin, and (2) using that answer together with the CT and nodal findings above, explain why this combination of findings — despite the tumor's very high proliferative index — was interpreted as localized (non-metastatic) disease potentially amenable to a curative-intent treatment strategy rather than a purely palliative one.\nCase: An 85-year-old man had a poorly differentiated small-cell neuroendocrine carcinoma of the mid-esophagus. The tumor was strongly positive for synaptophysin and INSM1. Its Ki-67 proliferation index approached 100%.\n\nCT showed esophageal wall thickening without distant metastases. Neither CT nor endoscopic ultrasound (EUS) showed pathologically enlarged lymph nodes. Endoscopy showed a 6 cm ulcerated, fungating mass involving about three-quarters of the esophageal circumference.\n\nImages: The supplied cross-sectional EUS image shows the mass. The arrows mark the tumor's outer margins.\n\nQuestion: What anatomic staging interpretation, including the deepest layer reached, supports curative-intent treatment despite the Ki-67 index?"},{"id":"q01-7150a3fdf6e31672","specialty":"Abdominal/Hepatobiliary Radiology","type":"Investigation Interpretation","month":"2026-05","claude_score":3,"gemini_score":2.0,"title":"Hepatic pseudolymphoma with hepatobiliary-phase ring-like hyperintensity on gadoxetic acid–enhanced MRI: radiologic–pathologic correlation with intratumoral fibrosis","image_count":1,"has_response":false,"search_text":"The provided image shows two MRI panels from the same slice location of a ring-shaped structure found inside a 3-cm liver mass. Left panel: fat-suppressed T2-weighted image. Right panel: hepatobiliary-phase image acquired after gadoxetic acid (EOB) contrast administration. In both panels the arrows mark the same ring-shaped structure, and the asterisks mark the same zone of tissue just outside the ring. Outside the ring, the rest of the mass is hyperintense on the T2 image and hypointense on the hepatobiliary-phase image (the pattern typical of the mass as a whole). The ring itself shows the opposite pattern: it is hypointense on the T2 image and hyperintense, relative to the rest of the mass, on the hepatobiliary-phase image. Serum tumor markers (PIVKA-II, CEA, CA19-9) were all normal, and the mass was ultimately shown at surgery to be a benign reactive lymphoid lesion rather than a carcinoma. Question: What tissue does the ring most likely represent, what biophysical mechanism produces its hepatobiliary-phase hyperintensity, and why does this internal-ring pattern NOT represent a 'targetoid' appearance of the type used to flag non-hepatocellular-carcinoma malignancy on hepatobiliary-phase imaging?\nCase: A 3-cm liver mass contains a ring-shaped structure. Serum PIVKA-II, CEA, and CA19-9 levels are normal. Surgery later showed a benign reactive lymphoid lesion rather than carcinoma.\n\nImages: Panels A and B show the same slice. Panel A is a fat-suppressed T2-weighted image. Panel B is a hepatobiliary-phase image obtained after gadoxetic acid administration. The arrows mark the same internal ring, and the asterisks mark the same tissue just outside it. Most of the mass is T2 hyperintense and hepatobiliary-phase hypointense. The ring is T2 hypointense and relatively hyperintense on the hepatobiliary-phase image.\n\nQuestion: What tissue does the ring most likely represent?"},{"id":"q01-7f0f92f0cce145e8","specialty":"Cardiac Surgery / Cardiac Anesthesiology","type":"Mechanism","month":"2026-07","claude_score":3,"gemini_score":2.0,"title":"Adequate Venous Drainage Does Not Exclude Cannula Malposition: Right Ventricular Perforation during Minimally Invasive Aortic Valve Replacement","image_count":1,"has_response":false,"search_text":"During minimally invasive cardiac surgery, a large-bore femoral venous drainage cannula (with numerous side holes over a long perforated segment) was intended to run from the inferior vena cava through the right atrium into the superior vena cava, using vacuum-assisted venous drainage (VAVD). After cardiopulmonary bypass began, venous return was insufficient, so the cannula was advanced blindly a short distance without guidewire or obturator support. Venous return then improved immediately and the operation continued uneventfully until pericardial bleeding appeared during volume loading before weaning from bypass. The provided image is an intraoperative photograph taken after the chest was reopened via sternotomy, showing an instrument tip (arrow) exposed within the pericardial space. (1) What structure has this cannula perforated, and by what route did it reach the pericardial space? (2) Explain the mechanism by which venous drainage paradoxically improved after this event rather than worsening, integrating the cannula's side-hole configuration, the likely trajectory change, and the effect of VAVD.\nCase: During minimally invasive cardiac surgery, a large-bore femoral venous drainage cannula was intended to pass from the inferior vena cava, through the right atrium, and into the superior vena cava. The cannula had numerous side holes along a long perforated segment. Vacuum-assisted venous drainage was used.\n\nAfter cardiopulmonary bypass began, venous return was insufficient. The cannula was advanced blindly a short distance without a guidewire or obturator. Venous return improved immediately, and the operation continued uneventfully. During volume loading before weaning from bypass, pericardial bleeding appeared.\n\nImages: The intraoperative photograph was taken after the chest was reopened by sternotomy. The arrow marks an instrument tip exposed in the pericardial space.\n\nQuestion: What mechanism explains the improved venous drainage after the cannula was advanced?"},{"id":"q01-aadc73e1ca6da2e4","specialty":"Infectious Disease / Neuroradiology","type":"Investigation Interpretation","month":"2026-05","claude_score":3,"gemini_score":2.0,"title":"Guillain-Barré syndrome following Escherichia coli meningitis after cupping therapy: a case report","image_count":1,"has_response":false,"search_text":"The provided image shows two sagittal CT views of the same patient's lumbar spine (left and right panels), both obtained at admission, with red arrows marking a focal abnormality at the same vertebral level in each. The patient is a 53-year-old woman with systemic lupus erythematosus on chronic low-dose corticosteroids who presented with headache, vomiting, and progressive drowsiness 4 days after undergoing cupping and acupuncture over the low back for pain. On admission, lumbar puncture showed opening pressure >400 mmH2O, CSF white cell count 7480x10^6/L, protein 7641 mg/L, and glucose 0.2 mmol/L; CSF, blood, stool, urine, and sputum cultures were all negative, but CSF next-generation sequencing identified Escherichia coli-specific sequences. Based on the imaging finding and this history, what is the most likely anatomic source of the E. coli and the route by which it reached the central nervous system?\nCase: A 53-year-old woman with systemic lupus erythematosus was taking chronic low-dose corticosteroids. She presented with headache, vomiting, and progressive drowsiness. Four days earlier, she had undergone cupping and acupuncture over her lower back for pain.\n\nAt admission, lumbar puncture showed an opening pressure greater than 400 mmH2O. CSF contained 7,480 × 10^6 white cells/L, protein 7,641 mg/L, and glucose 0.2 mmol/L. Cultures of CSF, blood, stool, urine, and sputum were negative. CSF next-generation sequencing detected Escherichia coli-specific sequences.\n\nImages: The left and right panels are sagittal CT views of the lumbar spine obtained at admission. In both panels, red arrows mark a focal abnormality at the same vertebral level.\n\nQuestion: What is the most likely pathway of Escherichia coli infection from its source to the central nervous system?"},{"id":"q02-1e4b14239c69397d","specialty":"Interventional Radiology","type":"Mechanism","month":"2026-06","claude_score":3,"gemini_score":2.0,"title":"Stent-graft delivery across a highly tortuous proper hepatic artery using balloon anchoring, an inner dilator, and partial unsheathing","image_count":1,"has_response":false,"search_text":"A self-expanding covered stent-graft is being deployed across a very tortuous arterial segment (quantified tortuosity index 1.67, well above prior reported cases) to exclude a hepatic-artery aneurysm. This stent-graft type deploys by pulling and unraveling a circumferential suture in a distal-to-proximal direction. The provided angiographic image shows the target vessel after the delivery sheath had been advanced through the aneurysm and the vessel had been mechanically straightened over a stiff guidewire, immediately before stent-graft deployment (arrowheads mark abrupt angulated segments along the straightened course). Given the deployment mechanics of this stent type and the appearance in the image, name the specific mechanical failure mode this vessel configuration puts the stent-graft at risk for during deployment, and describe how the operators mitigated it while still deploying the graft (rather than abandoning stent placement).\nCase: A self-expanding covered stent-graft is being deployed across a highly tortuous hepatic artery to exclude an aneurysm. The tortuosity index is 1.67, above previously reported values. The graft deploys from distal to proximal as a circumferential suture is pulled and unraveled. Before deployment, the delivery sheath was advanced through the aneurysm, and a stiff guidewire mechanically straightened the vessel.\n\nImages: The angiogram shows the straightened vessel immediately before deployment. Arrowheads mark abrupt angulated segments along its course.\n\nQuestion: What specific mechanical failure mode is the stent-graft at risk for during deployment?"},{"id":"q02-56dadfab8ab8f11e","specialty":"Thoracic Radiology / Oncologic Imaging","type":"Investigation Interpretation","month":"2026-03","claude_score":3.0,"gemini_score":2.0,"title":"Systemic sclerosis associated with silicosis in an agricultural worker: A case of Erasmus syndrome","image_count":1,"has_response":true,"search_text":"The provided image is an axial chest CT (mediastinal window) from the same patient. Nonvisual context: this scan was obtained for surveillance after previously treated ovarian carcinoma; no new, enlarging, or irregular masses were seen on this or prior follow-up imaging, and the calcified lung micronodules noted elsewhere were uniformly small (about 2-5 mm) and unchanged over time rather than variable in size or progressive. The patient has no history of tuberculosis, and there is no cavitation, coarse or irregular calcification, or extrapulmonary granulomatous disease (no skin or eye involvement). Based on the calcification pattern shown in the image together with these nonvisual features, what process best explains these findings, and what two specific features (one nodal, one about the pulmonary micronodules) argue against a recurrent/metastatic tumor origin given her cancer history?\nCase: This surveillance scan was obtained after treatment for ovarian carcinoma. Current and prior follow-up imaging showed no new, enlarging, or irregular masses. Calcified pulmonary micronodules seen elsewhere measured about 2–5 mm, were uniformly small, and remained unchanged over time. The patient has no history of tuberculosis. There is no cavitation, coarse or irregular calcification, or extrapulmonary granulomatous disease, including skin or eye involvement.\n\nImages: The provided image is an axial chest CT in a mediastinal window from the same patient.\n\nQuestion: What process best explains these findings?"},{"id":"q02-92fa6c16f26c4130","specialty":"Neonatology / Pediatric Cardiology","type":"Mechanism","month":"2026-04","claude_score":3.0,"gemini_score":2.0,"title":"Intraoperative Hemodynamic Collapse During Patent Ductus Arteriosus Ligation in an Extremely Low-Birth-Weight Infant: A Case Report","image_count":0,"has_response":false,"search_text":"During ligation of a hemodynamically significant patent ductus arteriosus in an extremely preterm infant, an abrupt intraoperative collapse occurred about 15 minutes after skin incision: oxygen saturation fell precipitously, heart rate dropped to 45/min, and blood pressure became unmeasurable for roughly 20 minutes. Continuous electrocardiographic monitoring showed a persistent normal sinus rhythm throughout this entire episode. Blood pressure and heart rate recovered promptly (within minutes) once the surgeon completed ligation of the ductus. Around this time, the infant had leukocytosis but a normal serum lactate and a normal platelet count, and no other clinical signs of infection. Echocardiography performed after the event showed no residual flow across the ductus and no findings of pulmonary hypertension. Given the temporal relationship between the collapse, its resolution, and the surgical event, the preserved cardiac rhythm, and these laboratory/echocardiographic findings, what is the most likely underlying mechanism for this intraoperative collapse, and what specific evidence lets you exclude septic shock and a persistent large ductal shunt (with pulmonary hypertensive crisis) as the cause?\nCase: An extremely preterm infant underwent ligation of a hemodynamically significant patent ductus arteriosus. About 15 minutes after skin incision, oxygen saturation fell abruptly, heart rate dropped to 45/min, and blood pressure was unmeasurable for roughly 20 minutes. Continuous electrocardiographic monitoring showed normal sinus rhythm throughout the collapse.\n\nBlood pressure and heart rate recovered within minutes after the surgeon completed the ligation. The infant had leukocytosis but normal serum lactate and platelet counts, with no other clinical signs of infection. Post-event echocardiography showed no residual ductal flow or pulmonary hypertension.\n\nQuestion: What mechanism best explains this intraoperative collapse?"},{"id":"q03-55a5b010b2778654","specialty":"Periodontology / Pediatric Dentistry","type":"Treatment","month":"2026-04","claude_score":3.0,"gemini_score":2.0,"title":"Clinical Presentation and Surgical Management of Idiopathic Gingival Fibromatosis: A Case Report","image_count":0,"has_response":false,"search_text":"In managing this 11-year-old boy's severe generalized gingival overgrowth, the clinicians identified two patient-specific factors that complicated surgical planning and would be expected to raise the risk of recurrence after gingival surgery. Identify both factors, and describe the specific perioperative strategy that was used to address each one.\nCase: An 11-year-old boy has severe generalized gingival overgrowth. Two patient-specific factors complicated surgical planning and increased the expected risk of recurrence after gingival surgery.\n\nQuestion: What were the two patient-specific factors?"},{"id":"q01-00bd5e334bc52aae","specialty":"Radiology / Surgical Anatomy","type":"Complication","month":"2026-07","claude_score":3,"gemini_score":3.0,"title":"Segmental vertebral artery agenesis with deep cervical reconstitution in a cervicothoracic variant cluster","image_count":1,"has_response":false,"search_text":"An elderly woman underwent neck CTA. The left panel of the provided image is a sagittal CT slice through the lower neck/upper thorax (left lateral view); from top to bottom it shows the lower cervical spine, a round vascular structure just anterior to the trachea, the air-filled trachea, a second smaller vascular structure below the first and immediately anterior to the aortic arch, the aortic arch itself, and the sternal manubrium at the bottom. The right panel is a coronal CT slice (anterior view) at the same body level, showing the trachea, an oval vascular structure directly beneath it, the medial (sternal) ends of the two clavicles flanking a dark space, and the manubrium below. Non-imaging findings: the clavicular cortical surface in contact with the manubrium measured about 20% of the total articular width on the right and about 21% on the left (both below the 25% threshold that defines normal sternoclavicular joint contact); the brachiocephalic trunk had a common origin with the left common carotid artery and rose 2.11 cm above the sternal manubrium before crossing the trachea from left to right. Using the image and these measurements, (1) name the anatomic space that has been created between the two clavicular heads and explain the mechanism by which it formed, and (2) identify which vessel seen in the sagittal panel is positioned to project into that space, and describe the specific hazard this poses during a midline anterior neck procedure such as tracheostomy or thyroidectomy.\nCase: An elderly woman underwent neck CTA. Sternoclavicular cortical contact was about 20% on the right and 21% on the left, below the 25% threshold for normal articulation. The brachiocephalic trunk shared an origin with the left common carotid artery, rose 2.11 cm above the manubrium, and crossed the trachea from left to right.\n\nImages: The left panel is a left-lateral sagittal CT through the lower neck/upper thorax. Anterior to the air-filled trachea are a round cranial vessel and, below it, a smaller vessel immediately anterior to the aortic arch; the manubrium is inferior. The right panel is an anterior coronal CT at the same level, showing the trachea, an oval vessel beneath it, the medial clavicular ends flanking a space, and the manubrium below.\n\nQuestion: (1) Name the space between the clavicular heads and explain how the abnormal sternoclavicular articulations formed it. (2) Identify the sagittal-panel vessel that projects into this space and explain the specific hazard during midline tracheostomy or thyroidectomy."},{"id":"q01-0668defa86bcaa23","specialty":"Veterinary Surgical Oncology / Neuroradiology","type":"Investigation Interpretation","month":"2026-04","claude_score":3,"gemini_score":3.0,"title":"Case Report: Surgical resection of high-grade extradural thoracic vertebral chondrosarcoma in a dog","image_count":1,"has_response":false,"search_text":"A dog was evaluated for spinal pain. The provided image shows T2-weighted MRI of the mid-thoracic spine: the left panel is a sagittal view spanning several vertebrae, and the two right panels are transverse views at two adjacent vertebral levels (each labeled with the vertebra shown). Red arrows mark a well-circumscribed extradural mass located parasagittal to the right dorsal vertebral compartment. On T1-weighted sequences (not shown), this mass was isointense to muscle, and after contrast administration it enhanced vividly. The mass stayed confined dorsal to the vertebrae, with no extension into the vertebral canal or contact with the spinal cord. Excisional histopathology later confirmed this mass to be a chondrosarcoma (a cartilage-forming bone tumor).\n\nLooking at the internal T2 signal pattern within the mass on this image, and reasoning from general principles of how cartilage-forming tumors mature and mineralize, would you predict this chondrosarcoma to be low-grade (well-differentiated) or high-grade (poorly differentiated)? Explain the tissue-level mechanism that links the degree of internal MRI signal heterogeneity in a cartilaginous tumor to its histologic grade.\nCase: A dog with spinal pain underwent MRI of the mid-thoracic spine. A well-circumscribed extradural mass was parasagittal to the right dorsal vertebral compartment. It was isointense to muscle on T1-weighted images and enhanced vividly after contrast. It remained dorsal to the vertebrae, without extension into the vertebral canal or contact with the spinal cord. Excisional histopathology confirmed a chondrosarcoma.\n\nImages: The T2-weighted MRI shows a sagittal view on the left and transverse views at T5 and T6 in the middle and right panels. Red arrows mark the mass.\n\nQuestion: What histologic grade does the internal T2 signal pattern predict, and what tissue-level process links cartilage maturation and mineralization to this pattern?"},{"id":"q01-0a70fc48dfc0fd08","specialty":"Oncology / Hepatobiliary Medicine","type":"Diagnosis","month":"2026-06","claude_score":3.0,"gemini_score":3.0,"title":"Intrahepatic Cholangiocarcinoma: The Weight of History","image_count":1,"has_response":false,"search_text":"A middle-aged man presents with three months of unintentional weight loss (15% of body weight), fever, night sweats, and inflammatory anemia (hemoglobin ~9.3 g/dL, ferritin markedly elevated at 7,000-8,000 ng/mL). An extensive infectious workup (viral serologies, blood/urine/bone marrow/mycobacterial cultures, tuberculosis testing) is negative. Repeated endoscopic evaluation of the upper and lower GI tract and an initial bone marrow biopsy/myelogram show no primary tumor. The provided image is a whole-body FDG-PET-CT maximum-intensity-projection scan; the upper arrow marks a focus of uptake in the upper abdomen and the lower arrow marks a focus of uptake in the pelvis, and diffuse additional dark foci are seen scattered through the skull, spine, ribs, and pelvis. A follow-up contrast CT five months after the first (which had shown a normal liver) demonstrates a new 14 mm hypovascular nodule in the right hepatic lobe. A bone biopsy from a rib lesion shows pleomorphic, some plasmacytoid, cells that are immunohistochemically positive for CK7 and AE1/AE3 and negative for S100, CDX2, CD38, and CK20. Serum PSA, CEA, and CA19-9 are all within normal limits, and PD-L1 (combined positive score) is 0. Based on the imaging distribution shown, the biopsy immunophenotype, and the pattern of negative studies, which single organ is most likely harboring the primary malignancy, and what specific pieces of evidence (from the image and from the biopsy/marker results) argue against (a) a primary hematologic/marrow malignancy and (b) a gastrointestinal or prostatic primary?\nCase: A middle-aged man has 3 months of 15% unintentional weight loss, fever, night sweats, anemia (hemoglobin about 9.3 g/dL), and ferritin of 7,000–8,000 ng/mL. Viral serologies, blood, urine, bone marrow and mycobacterial cultures, and tuberculosis testing are negative. Repeated upper and lower endoscopy and an initial marrow biopsy/myelogram find no primary tumor. Five months after an initial CT showed a normal liver, contrast CT reveals a new 14 mm hypovascular right-hepatic-lobe nodule.\n\nA rib-lesion biopsy shows pleomorphic, partly plasmacytoid cells positive for CK7 and AE1/AE3 and negative for S100, CDX2, CD38, and CK20. PSA, CEA, and CA19-9 are normal; PD-L1 combined positive score is 0.\n\nImage: Whole-body FDG-PET-CT maximum-intensity projection. The upper arrow marks a discrete upper-abdominal focus, the lower arrow marks pelvic uptake, and many additional foci involve the skull, spine, ribs, and pelvis.\n\nQuestion: Which single organ most likely contains the primary malignancy, and which findings from the uptake distribution, biopsy immunophenotype, markers, and negative studies argue against (a) a primary hematologic or marrow malignancy and (b) a gastrointestinal or prostatic primary?"},{"id":"q01-1cabe519e6093880","specialty":"Pediatric Cardiology / Vascular Medicine","type":"Investigation Interpretation","month":"2026-07","claude_score":3,"gemini_score":3.0,"title":"Case Report: Infection-triggered multiple organ dysfunction syndrome as the initial presentation of undiagnosed turner syndrome in an 11-Year-Old girl","image_count":1,"has_response":false,"search_text":"An 11-year-old girl was found on genetic testing to have a large deletion spanning most of one X chromosome (45,X karyotype). She also had chronic, poorly controlled hypertension (blood pressure up to 159/111 mmHg) with a markedly activated renin-angiotensin-aldosterone axis (plasma renin >500 pg/mL, aldosterone 27.9 ng/dL supine, angiotensin II 76.9 pg/mL). The provided image shows two axial contrast-enhanced CT slices from the same scan: left, a thoracic-level slice through the heart and descending aorta; right, an abdominal-level slice through the kidneys and abdominal aorta. A red dashed circle marks the same type of finding at each level. Describe the vascular abnormality indicated by the circled findings, and explain two distinct contributing mechanisms - one related to her chromosomal disorder and one related to her hemodynamic status - that plausibly explain why this abnormality developed.\nCase: An 11-year-old girl had a large deletion spanning most of one X chromosome, with a 45,X karyotype. She had chronic, poorly controlled hypertension reaching 159/111 mmHg. Her renin-angiotensin-aldosterone axis was markedly activated: plasma renin was >500 pg/mL, supine aldosterone was 27.9 ng/dL, and angiotensin II was 76.9 pg/mL.\n\nImages: Axial contrast-enhanced CT images are from the same scan. Panel A is a thoracic slice through the heart and descending aorta. Panel B is an abdominal slice through the kidneys and abdominal aorta. The red dashed circles mark the same type of finding at both levels.\n\nQuestion: What vascular abnormality is circled, and how could her chromosomal disorder and hemodynamic state each have contributed to its development?"},{"id":"q01-1f2873ce09817edf","specialty":"Endodontics","type":"Investigation Interpretation","month":"2026-04","claude_score":3,"gemini_score":3.0,"title":"Long-term outcome of combined orthograde and surgical management of perforating internal root resorption using a bioceramic repair material: an eight-year CBCT-documented case report","image_count":1,"has_response":false,"search_text":"An adult patient had pain on biting and discoloration of a maxillary anterior tooth with a prior composite restoration and a history of orthodontic treatment. The tooth did not respond to pulp sensibility testing while neighboring teeth tested normally, periodontal probing depths were within normal limits, and there was no sinus tract or swelling. When the pulp chamber was entered under an operating microscope, profuse bleeding occurred from the canal. The tooth was disinfected non-surgically; two weeks later, although the patient was asymptomatic, the canal was still draining persistent exudate, which led to a surgical flap procedure in which a defect on the root surface was located, debrided, sealed with a bioceramic putty, and covered with a bone graft, with the canal obturated afterward.\n\nThe provided image shows six CBCT cross-sections of the affected root: the top row (left to right: axial, sagittal, coronal) was acquired before any treatment; the bottom row (left to right: axial, sagittal, coronal) shows the same three planes obtained 8 years after the combined nonsurgical-surgical treatment described above.\n\n1. Based on the top-row images together with the clinical findings (bleeding on access, negative pulp sensibility, persistent post-instrumentation drainage despite no swelling), what pathologic process is affecting the root, and what specific anatomic relationship shown on the images explains why the canal kept draining even after two weeks of intracanal disinfection?\n2. Comparing the bottom row to the top row, what specific findings indicate that the outcome represents true structural healing rather than only symptom resolution?\nCase: An adult has pain on biting and discoloration of a previously restored maxillary anterior tooth after orthodontic treatment. The tooth is unresponsive to pulp sensibility testing, while adjacent teeth respond normally. Periodontal probing is normal, with no sinus tract or swelling. Access under an operating microscope causes profuse canal bleeding. After nonsurgical disinfection, the patient is asymptomatic, but persistent canal exudate remains at 2 weeks. A surgical flap then reveals a root-surface defect, which is debrided, sealed with bioceramic putty, and covered with a bone graft before canal obturation.\n\nImages: CBCT sections in axial, sagittal, and coronal planes. The top row is pretreatment; the bottom row shows the same planes 8 years after combined nonsurgical and surgical treatment.\n\nQuestions:\n1. What root pathology is shown before treatment, and what anatomic communication explains persistent drainage despite intracanal disinfection?\n2. Which specific changes on the 8-year CBCT demonstrate structural healing rather than symptom relief alone?"},{"id":"q01-2937c0e54268f3d4","specialty":"Oncology","type":"Mechanism","month":"2026-03","claude_score":3,"gemini_score":3.0,"title":"Regression of a Non-Irradiated Lung Adenocarcinoma During Glioblastoma-Directed Chemoradiotherapy: A Case Report","image_count":1,"has_response":true,"search_text":"A patient had synchronous glioblastoma and an early-stage lung adenocarcinoma. No lung-directed therapy of any kind was ever given. The lung nodule's longest diameter was 18 mm at diagnosis (week 0), 12 mm at week 13, and 9 mm at week 19. The provided image shows the treatment timeline for the brain tumor (top row, with corresponding brain MRI scans) aligned against the same week axis as the lung CT scans (bottom row, at weeks 0, 13, and 19). Using only the timing of cranial radiotherapy, temozolomide, and bevacizumab shown in the image, together with the nodule measurements above: (1) state whether each of the two regression intervals (weeks 0-13 and weeks 13-19) occurred while cranial radiotherapy was actively being delivered or after it had already ended, and (2) name the one systemic drug whose introduction date best coincides with the onset of the second regression interval.\nCase: A patient had synchronous glioblastoma and early-stage lung adenocarcinoma. The lung cancer received no directed treatment. The lung nodule’s longest diameter was 18 mm at diagnosis (week 0), 12 mm at week 13, and 9 mm at week 19.\n\nImages: The top row shows the brain-tumor treatment timeline with corresponding brain MRI scans. The bottom row shows lung CT scans at weeks 0, 13, and 19 on the same time axis.\n\nQuestion: Which treatment-timeline interpretation fits the two regression intervals, including radiotherapy status and the newly introduced systemic drug?"},{"id":"q01-6236e42a6040c208","specialty":"Pediatric Epileptology/Clinical Neurophysiology","type":"Investigation Interpretation","month":"2026-07","claude_score":3,"gemini_score":3.0,"title":"A novel mutation in SETD1A is associated with early-onset epilepsy—a rare case report","image_count":1,"has_response":false,"search_text":"A young child has had focal-to-bilateral tonic-clonic seizures since early infancy. Every focal seizure begins the same way: clonic jerking of the right hand together with forced turning of the head and eyes to the right, which then spreads up the right arm, down to the right leg, and into the right side of the face. The provided image is a 16-channel scalp EEG (standard international 10-20 electrode placement, ipsilateral ear-lobe reference: A1 = left ear, A2 = right ear) recorded while the child was awake and resting. Channel labels in the image indicate scalp position (e.g., Fp1/F3/F7/C3/T3/P3/O1 are left-sided derivations referenced to A1; Fp2/F4/F8/C4/T4/P4/O2 are right-sided derivations referenced to A2). Using (1) the lateralizing value of the seizure semiology and (2) the distribution of the epileptiform discharge visible in the image, state which hemisphere the clinical (ictal) signs localize to, describe where the interictal discharge is most prominent in the image, and say whether the two sources of evidence are concordant or discordant with each other.\nCase: A young child has had focal-to-bilateral tonic-clonic seizures since early infancy. Each focal seizure has the same onset: right-hand clonic jerking with forced turning of the head and eyes to the right. The jerking then spreads up the right arm, down the right leg, and to the right side of the face.\n\nImages: The image shows a 16-channel scalp EEG recorded while the child was awake and resting. It uses standard 10-20 electrode placement and ipsilateral ear-lobe references. A1 is the left ear and A2 is the right ear. The left-sided Fp1/F3/F7/C3/T3/P3/O1 channels are referenced to A1, and the corresponding right-sided channels are referenced to A2.\n\nQuestion: Where do the seizure semiology and interictal EEG discharge each localize, and are they concordant?"},{"id":"q01-85d4de123a9e8f5b","specialty":"General Surgery / Gastroenterology","type":"Mechanism","month":"2026-03","claude_score":3,"gemini_score":3.0,"title":"Sequential pancreatitis and diverticulitis following elective anterior lumbar disc replacement: a case report of a rare postoperative domino effect","image_count":2,"has_response":true,"search_text":"A man with type 2 diabetes underwent elective spinal surgery via a retroperitoneal approach to the lumbar spine, complicated intraoperatively by major blood loss requiring transfusion. On postoperative day 1 he developed fever and severe abdominal pain; labs showed markedly elevated lipase/amylase and inflammatory markers, and a CT scan (left image) confirmed pancreatitis, with an incidental small colonic diverticulum that showed no surrounding inflammation at that time. He was treated conservatively and improved over the next several days. On postoperative day 11, after resuming oral intake, he developed recurrent fever and abdominal pain. A follow-up CT scan (right image) showed persistent pancreatic disease with collections now interpreted as walled-off pancreatic necrosis located in the pelvis, together with diverticulosis of the same colon segment seen on the first scan — but still no perforation. Four days later he developed diffuse peritonitis and was found at laparotomy to have a perforated colonic diverticulum. Using both images and the clinical course, explain (1) the anatomic route by which pancreatic-origin fluid/necrosis reached the pelvis despite the pancreas being located in the upper abdomen, and (2) the separate physiologic mechanism by which the previously uninflamed diverticulum progressed to perforation.\nCase: A man with type 2 diabetes underwent elective lumbar spine surgery through a retroperitoneal approach. Major intraoperative blood loss required transfusion.\n\nOn postoperative day 1, he developed fever and severe abdominal pain. Lipase, amylase, and inflammatory markers were markedly elevated. Initial CT (Image 1, panels A–B) confirmed pancreatitis and showed a small colonic diverticulum without surrounding inflammation. Conservative treatment led to improvement over the next several days.\n\nOn postoperative day 11, after oral intake resumed, fever and abdominal pain recurred. Follow-up CT (Image 2, panels C–D) showed persistent pancreatic disease and collections interpreted as walled-off pancreatic necrosis in the pelvis, although the pancreas is in the upper abdomen. The same colonic segment had diverticulosis but no perforation.\n\nFour days later, he developed diffuse peritonitis. Laparotomy revealed a perforated colonic diverticulum.\n\nQuestion: Using the CT images and clinical course, what separate mechanisms explain the pelvic pancreatic necrosis and later diverticular perforation?"},{"id":"q01-a51153fb98aef23d","specialty":"Periodontology / Oral and Maxillofacial Surgery","type":"Mechanism","month":"2026-06","claude_score":3.0,"gemini_score":3.0,"title":"Digitally guided diode-laser cheiloplasty for correction of upper-lip asymmetry: a case report","image_count":1,"has_response":false,"search_text":"A woman presented with mild asymmetry of the upper lip: the right side appeared less well-defined than the left, with no other facial deformity, scarring, or functional impairment (no speech difficulty or drooling). The provided image shows two baseline photographs of the same patient taken before any treatment: left, a close-up frontal view of the lips at rest; right, an intraoral view of the upper teeth with one tooth circled in orange. Using the anatomic relationship visible between the two images, state which dental finding is contributing to the lip asymmetry and explain the mechanism by which it produces the appearance of an under-defined right upper-lip tubercle.\nCase: A woman had mild upper-lip asymmetry. Her right upper-lip tubercle was less well defined than the left. She had no other facial deformity or scarring, speech difficulty, drooling, or functional impairment.\n\nImages: These baseline photographs show the same patient before treatment. The left panel shows the lips at rest. The right panel shows the upper teeth, with one tooth circled in orange.\n\nQuestion: What dental mechanism explains the under-defined right upper-lip tubercle?"},{"id":"q01-ac34b965d8373a1e","specialty":"Obstetrics and Gynecology / Reproductive Endocrinology","type":"Investigation Interpretation","month":"2026-04","claude_score":3,"gemini_score":3.0,"title":"Pregnancy Outcomes in Three Distinct Uterine Anomalies: A Case Series","image_count":1,"has_response":false,"search_text":"The provided image is a transabdominal pelvic ultrasound obtained early in a pregnancy in a woman with a history of several first-trimester pregnancy losses and one prior term cesarean delivery for breech presentation. Based solely on the anatomy shown in the image, state the specific congenital uterine anomaly demonstrated, name the embryologic developmental failure (defective duct formation, defective duct fusion, or failure of septal resorption) that produces this anatomy, and give one specific imaging feature visible here that would exclude a septate uterus as the diagnosis.\nCase: A woman in early pregnancy has had several first-trimester pregnancy losses and one prior term cesarean delivery for breech presentation.\n\nImages: The transabdominal pelvic ultrasound labels the right (RT) and left (LT) sides. Arrows mark the uterine anatomy to assess.\n\nQuestion: What congenital uterine anomaly is shown?"},{"id":"q01-be2690a43a0bd6c7","specialty":"Abdominal/Hepatobiliary Radiology","type":"Investigation Interpretation","month":"2026-06","claude_score":3,"gemini_score":3.0,"title":"Primary malignant peripheral nerve sheath tumor of the liver: a case report and literature review","image_count":2,"has_response":false,"search_text":"A woman in her fifties presented with several weeks of upper abdominal pain, distention, and unintentional weight loss. She had no history of viral hepatitis, cirrhosis, or jaundice, and serum alpha-fetoprotein (AFP), carcinoembryonic antigen (CEA), and CA19-9 were all within normal limits. Contrast-enhanced CT showed a well-defined, heterogeneous 7 cm mass in the left hepatic lobe, without intrahepatic or extrahepatic bile duct dilation and without invasion of the hepatic veins or portal vein. The two provided images are axial contrast-enhanced CT slices at the same level, each showing the mass marked by an arrow: the left image is the arterial phase; the right image is the portal venous phase. On a delayed acquisition obtained about 3 minutes after contrast injection (not shown), the mass showed further persistent, mild, heterogeneous enhancement, with no washout at any phase.\n\nUsing the enhancement behavior visible across these two images, the delayed-phase trend, and the stated laboratory/history findings, state which of the following three hepatic malignancies can reasonably be excluded — hepatocellular carcinoma, intrahepatic cholangiocarcinoma, and hepatic angiosarcoma — and give the specific feature(s) that exclude each one.\nCase: A woman in her 50s presented with several weeks of upper abdominal pain, distention, and unintentional weight loss. She had no history of viral hepatitis, cirrhosis, or jaundice. Serum AFP, CEA, and CA19-9 levels were normal.\n\nContrast-enhanced CT showed a well-defined, heterogeneous 7 cm mass in the left hepatic lobe. There was no intrahepatic or extrahepatic bile duct dilation and no hepatic or portal vein invasion.\n\nImages: Images 1 and 2 are axial contrast-enhanced CT slices at the same level, with an arrow marking the mass. Image 1 is the arterial phase, and Image 2 is the portal venous phase. A delayed acquisition about 3 minutes after contrast injection is not shown. It demonstrated further persistent, mild, heterogeneous enhancement without washout in any phase.\n\nQuestion: Which of these can reasonably be excluded—hepatocellular carcinoma, intrahepatic cholangiocarcinoma, or hepatic angiosarcoma—and which findings exclude each?"},{"id":"q01-cc4ad160007454a4","specialty":"Emergency Medicine - Dental Emergencies","type":"Investigation Interpretation","month":"2026-03","claude_score":3,"gemini_score":3.0,"title":"Dental Cement Placement to Temporize Recalcitrant Dental Pain From Acute Pulpitis","image_count":1,"has_response":true,"search_text":"The provided image shows two intraoral photographs of the same lower molar in a patient with a 4-day history of severe, constant tooth pain that intensifies with hot or cold stimuli and with pressure, but with no facial or gingival swelling on exam. Left: the tooth before any intervention, with two arrows marking the width of a vertical defect running from the chewing surface down to the gumline. Right: the same tooth after a temporary sealing material was packed into the defect, with two arrows marking the edges of that material. What specific dental tissue is exposed by the defect marked in the left image, and what is the immediate mechanistic reason that packing it with an inert sealing material (as shown on the right) reduces the tooth pain, even though this covering does not cure the underlying disease process?\nCase: A patient has had severe, constant lower-molar pain for 4 days. Hot, cold, and pressure worsen the pain. There is no facial or gingival swelling.\n\nImages: The left image shows the molar before treatment. Two arrows mark a vertical defect extending from the chewing surface to the gumline. The right image shows the same tooth after inert temporary sealing material was packed into the defect; the arrows mark its edges.\n\nQuestion: What mechanism, including the identity of the exposed tissue, explains the immediate pain reduction without curing the underlying disease?"},{"id":"q01-e2e21aed22075855","specialty":"Structural/Interventional Cardiology (TAVI)","type":"Mechanism","month":"2026-05","claude_score":3.0,"gemini_score":3.0,"title":"Acute leaflet opening restriction caused by endarterectomy-like iliac artery intimal detachment entrapped within a self-expanding transcatheter aortic valve: a case report","image_count":1,"has_response":false,"search_text":"An older adult with severe aortic stenosis underwent transfemoral implantation of a self-expanding aortic valve. Preprocedural CT had shown a preserved but severely (270° circumferential) calcified segment in the common iliac artery used for access, and the operator felt mild resistance while advancing the valve delivery system across this segment. The valve deployed with a good fluoroscopic appearance (frame well expanded, no malposition, no coronary compromise). The provided image shows simultaneous left ventricular (LV) and ascending aortic (Ao) invasive pressure tracings recorded immediately before (left, panel A) and after (right, panel B) valve deployment, with the mean/peak transvalvular gradient labeled on each. Based on the tracings and the access-vessel history, (1) what do the tracings show about the effect of deployment on the transvalvular gradient, and (2) what mechanism involving the access vessel most plausibly explains a well-expanded valve that still fails to relieve the gradient, and what follow-up finding would confirm that mechanism?\nCase: An older adult with severe aortic stenosis underwent transfemoral implantation of a self-expanding aortic valve. Preprocedural CT showed a preserved lumen in the common iliac access segment, with 270° circumferential calcification. Mild resistance occurred as the delivery system crossed this segment. After deployment, fluoroscopy showed a well-expanded valve frame without malposition or coronary compromise.\n\nImages: Panel A (left) and panel B (right) show simultaneous left ventricular and ascending aortic pressure tracings immediately before and after deployment, respectively. The mean/peak transvalvular gradients are labeled.\n\nQuestion: What access-vessel mechanism most plausibly explains the post-deployment pressure findings?"},{"id":"q01-e928f34b7ffc9201","specialty":"Abdominal Radiology / General Surgery","type":"Investigation Interpretation","month":"2026-04","claude_score":3.0,"gemini_score":3.0,"title":"Splenic Flexure Colon Cancer Presenting as a Perisplenic Abscess With Subsequent Intrasplenic Abscess Formation and Portal Venous Gas: A Case Report","image_count":2,"has_response":false,"search_text":"A man being treated with percutaneous catheter drainage and broad-spectrum antibiotics for a left upper quadrant intra-abdominal abscess (secondary to a contained perforation at the colon's splenic flexure) underwent two axial contrast-enhanced abdominal CT scans at the level of the liver and spleen. The provided images show the same slice level from this patient: left image, obtained on treatment day 3; right image, obtained on treatment day 9. Across this 6-day interval, the patient had no worsening abdominal pain, no rebound tenderness or guarding, and his C-reactive protein and other inflammatory markers were trending downward. No emergency operation was performed in this interval. Using the two images, describe (1) the interval change in the gas/fluid collection within the splenic parenchyma, and (2) the interval change in the hepatic/portal finding, then explain why this combination of trends argued against bowel ischemia and supported continuing non-operative management rather than emergent laparotomy.\nCase: A man had a left upper-quadrant intra-abdominal abscess from a contained perforation at the splenic flexure. He was treated with percutaneous catheter drainage and broad-spectrum antibiotics. Over the next 6 days, he had no worsening abdominal pain, rebound tenderness, or guarding. His C-reactive protein and other inflammatory markers decreased. No emergency operation was performed.\n\nImages: Image 1 is an axial contrast-enhanced abdominal CT at the level of the liver and spleen on treatment day 3. Image 2 shows the same level on day 9. Compare the gas/fluid collection in the splenic parenchyma and the hepatic/portal finding.\n\nQuestion: What is the clinical interpretation of the interval imaging changes, including their management significance?"},{"id":"q01-ea9a728f8924aa19","specialty":"Interventional Radiology / Gastroenterology (ERCP)","type":"Investigation Interpretation","month":"2026-07","claude_score":3,"gemini_score":3.0,"title":"Delayed intrabiliary migration of embolization material after hepatic arterial embolization: a case report","image_count":1,"has_response":false,"search_text":"A patient with a metallic-coil embolization of a right hepatic artery pseudoaneurysm later developed recurrent choledocholithiasis and cholangitis. The provided image has two panels obtained at different times during the subsequent work-up: left, a T-tube cholangiogram obtained after endoscopic treatment of the first recurrent episode, showing a dilated biliary tree and a metallic density near the hepatic hilum (arrow), with no definite intraductal filling defect; right, fluoroscopic imaging obtained roughly six months later during a repeat ERCP for another cholangitis episode, again showing a metallic wire-like structure projected over the hepatic hilum (arrow), also without a definite filling defect. At both time points, clinicians could not determine whether the metallic material was truly inside the bile duct lumen or merely adjacent to it. Explain the fundamental imaging limitation shared by both panels that prevented definitive localization of the coil material relative to the bile duct at either time point, and state what kind of finding would be required to overcome this limitation.\nCase: A patient underwent metallic-coil embolization of a right hepatic artery pseudoaneurysm. The patient later developed recurrent choledocholithiasis and cholangitis.\n\nImages:\n- Panel A: A T-tube cholangiogram after endoscopic treatment of the first recurrence shows a dilated biliary tree and metallic density near the hepatic hilum (arrow), without a definite intraductal filling defect.\n- Panel B: Fluoroscopy during repeat ERCP about six months later for another cholangitis episode shows a metallic wire-like structure over the hepatic hilum (arrow), again without a definite filling defect.\n\nAt both time points, it was unclear whether the metallic material was inside the bile duct lumen or adjacent to it.\n\nQuestion: What shared imaging limitation caused this uncertainty, and what finding would definitively establish intraductal position?"},{"id":"q01-eb8dbd841a6b6c21","specialty":"Neuromuscular Medicine / Musculoskeletal Radiology","type":"Mechanism","month":"2026-05","claude_score":3,"gemini_score":3.0,"title":"Cesarean delivery in a patient with inclusion body myositis: is general anesthesia safe? A case report","image_count":1,"has_response":false,"search_text":"The provided image shows two paired sets of bilateral thigh MRI images from a pregnant patient with several years of slowly progressive limb weakness. The top pair shows an axial cross-section through both thighs (left) with its corresponding longitudinal image (right); the bottom pair shows a second axial cross-section through both thighs (left) with its corresponding longitudinal image (right). One pair demonstrates chronic muscle atrophy with fatty change, and the other demonstrates active muscle edema. On examination, this patient had symmetric strength grading — Grade IV bilaterally in the upper limbs and Grade II bilaterally in the proximal lower limbs — with marked bilateral quadriceps atrophy. The muscle disease she carries is classically described in the literature as producing asymmetric weakness between limbs. Comparing the right and left thigh within each image pair, and relating this to her bilateral symmetric strength grades, is her muscle involvement pattern typical or atypical for the disease's classic description, and what disease-duration-related explanation could reconcile any discrepancy?\nCase: A pregnant patient has had slowly progressive limb weakness for several years. Strength is Grade IV bilaterally in the upper limbs and Grade II bilaterally in the proximal lower limbs. She has marked bilateral quadriceps atrophy. Her muscle disease is classically described as causing asymmetric weakness between limbs.\n\nImages: Panels A (top) and B (bottom) each show an axial MRI through both thighs on the left and corresponding longitudinal images on the right. One panel shows chronic muscle atrophy with fatty change; the other shows active muscle edema. Compare the right and left thighs in each panel.\n\nQuestion: What disease-course explanation reconciles the MRI pattern and symmetric strength grades with the classic presentation?"},{"id":"q01-f7d8cfb92d6dd284","specialty":"Vascular Surgery","type":"Investigation Interpretation","month":"2026-06","claude_score":3,"gemini_score":3.0,"title":"Isolated Brachiocephalic Artery Dissection after Two-Debranching Thoracic Endovascular Aortic Repair: A Case Report","image_count":1,"has_response":false,"search_text":"An elderly man underwent elective two-vessel debranching thoracic endovascular aortic repair (TEVAR) for a distal aortic arch aneurysm. During that procedure, a bypass graft was constructed from the right axillary artery to the left common carotid artery and on to the left axillary artery, with the right axillary artery serving as the graft's sole inflow source; the native origins of the left subclavian and left common carotid arteries were then occluded. Five days later he developed sudden chest pain and transient loss of consciousness. Blood pressure was unmeasurable in BOTH upper limbs (with only weak radial pulses), while lower-limb blood pressure remained normal. CT performed at that moment showed a new dissection of the brachiocephalic artery (which normally gives rise to the right subclavian/axillary artery and the right common carotid artery) with an entry tear near its origin and severe compression of its true lumen by a false lumen. The provided image shows two panels from that CT: the left panel is a coronal reformat centered on the brachiocephalic artery and adjacent aorta, showing the entry tear (red arrow) and the true-lumen compression by the false lumen (red arrowheads); the right panel is an axial image taken at the level of the right internal carotid artery, showing a small contrast focus (yellow arrow) separate from the narrowed true lumen. Using the imaging finding in the right panel together with the bypass configuration described above, explain (1) why flow to the right internal carotid artery / right cerebral circulation was preserved despite the severe true-lumen compression shown in the left panel, and (2) why BOTH upper limbs, not only the right, became critically hypoperfused even though the dissection was confined to the right brachiocephalic artery.\nCase: An elderly man underwent two-vessel debranching TEVAR for a distal aortic arch aneurysm. A bypass ran from the right axillary artery to the left common carotid and then the left axillary artery, using the right axillary artery as its only inflow. The native left common carotid and subclavian origins were occluded.\n\nFive days later, he developed sudden chest pain and transient loss of consciousness. Blood pressure was unmeasurable in both arms, with weak radial pulses, but normal in the legs. CT showed a new brachiocephalic artery dissection with an entry tear near its origin and severe true-lumen compression by the false lumen.\n\nImages: In left panel C, the red arrow marks the entry tear and red arrowheads mark the compressed true lumen. Right panel D is an axial image at the right internal carotid artery; the yellow arrow marks a small contrast focus separate from the narrowed true lumen.\n\nQuestion: Using the yellow-arrow finding and bypass anatomy, explain (1) how right internal carotid/cerebral flow was preserved despite severe proximal true-lumen compression and (2) why a dissection confined to the right brachiocephalic artery critically reduced perfusion to both arms rather than only the right."},{"id":"q01-f96bf40928b47233","specialty":"Cardiology - Ischemic Heart Disease/Cardiac Imaging","type":"Diagnosis","month":"2026-05","claude_score":3.0,"gemini_score":3.0,"title":"Giant left ventricular pseudo-aneurysm","image_count":1,"has_response":false,"search_text":"A middle-aged man with a history of B-cell lymphoma treated one year earlier with anthracycline-based chemotherapy and autologous stem-cell transplant presented with acute chest pain, an elevated troponin, and new inferior Q waves on ECG without ST-segment elevation. A CT scan performed at that time to exclude pulmonary embolism incidentally captured the axial cardiac slice shown in the provided image. Because inflammatory markers were also compatible with pericardial/myocardial inflammation, the treating team diagnosed presumed perimyocarditis and started colchicine. Only later did coronary angiography reveal a chronic total occlusion of the first obtuse marginal coronary artery, and viability imaging confirmed viable myocardium in the region marked by the arrow in the image. Based on the appearance of the region indicated by the arrow together with the ECG/troponin pattern and the later angiographic finding, what does this CT image most likely already show at this early time point, and why is this finding, combined with the clinical data, inconsistent with a diagnosis of isolated perimyocarditis?\nCase: A middle-aged man with B-cell lymphoma received anthracycline-based chemotherapy and an autologous stem-cell transplant one year earlier. He presented with acute chest pain, elevated troponin, and new inferior Q waves without ST-segment elevation. At presentation, CT was obtained to exclude pulmonary embolism. Inflammatory markers were compatible with pericardial or myocardial inflammation, so presumed perimyocarditis was treated with colchicine. Coronary angiography later showed chronic total occlusion of the first obtuse marginal coronary artery. Viability imaging showed viable myocardium in the arrow-marked region.\n\nImages: The provided image is an axial cardiac CT slice from the initial scan. The arrow marks the region in question.\n\nQuestion: What diagnosis best explains the arrowed CT finding and the evidence against isolated perimyocarditis?"},{"id":"q01-fa25441b7b76c7be","specialty":"Orthopedic Surgery - Spine","type":"Investigation Interpretation","month":"2026-04","claude_score":3.0,"gemini_score":3.0,"title":"Single-Stage Posterior-Only In Situ Fixation and Fusion for Neglected Congenital Vertebral Aplasia With Kyphoscoliosis in a Resource-Limited Setting: A Case Report","image_count":1,"has_response":false,"search_text":"The provided image is a coronal 3D-CT bone reconstruction of the spine from an adult man with a longstanding, rigid thoracolumbar deformity, with vertebral levels labeled from C2 down to the sacrum (S). During surgical planning, pedicle screws were placed bilaterally at T7-T9 and bilaterally at L2-L4, plus a single screw on the right side at one additional vertebra, but no screws were placed anywhere within the segment that appears radiographically fused/non-segmented in the image, even though that segment was the apex of the deformity. (a) Based on the image, state the approximate vertebral level range in which individual vertebral bodies can no longer be distinguished from one another. (b) Using the fact that pedicles were congenitally absent at three consecutive thoracic levels with only a dysplastic (partially formed) pedicle at the next vertebra caudally, explain why this level range could not be instrumented directly and how the surgical team achieved correction across it without placing any screws inside it.\nCase: An adult man has a longstanding, rigid thoracolumbar deformity. Pedicle screws were placed bilaterally at T7–T9 and L2–L4, with one additional right-sided screw. No screws were placed within the fused segment at the apex. Pedicles were congenitally absent at three consecutive thoracic levels. Only a dysplastic, partially formed pedicle was present at the next caudal vertebra.\n\nImages: The supplied image is a coronal 3D CT bone reconstruction with vertebral levels labeled from C2 to the sacrum. It shows a radiographically fused, non-segmented region.\n\nQuestion: What is the non-segmented vertebral range, why could it not be directly instrumented, and how was correction achieved across it?"},{"id":"q01-fe31f468fae59f05","specialty":"Vascular Neurology / Neuroanatomy","type":"Mechanism","month":"2026-05","claude_score":3,"gemini_score":3.0,"title":"Case Report: Improvement in Swallowing Function Following DLPFC-Targeted Repetitive Transcranial Magnetic Stimulation in a Post-Stroke Patient with Cognitive Impairment","image_count":1,"has_response":false,"search_text":"The provided image shows two axial brain MRI slices from a patient who developed acute right-sided weakness, drowsiness, and impaired swallowing. Each panel contains a diffusion-weighted image (DWI, left half) next to its corresponding apparent diffusion coefficient (ADC) map (right half): the left pair is panel (a) and the right pair is panel (b). Both panels show a focal area of high DWI signal with matching low ADC signal (i.e., restricted diffusion consistent with acute infarction), but in two different brain regions. Clinically, videofluoroscopy at 3 months post-stroke showed severely impaired oral bolus formation and prolonged oral transit; no pharyngeal swallow was ever triggered, so pharyngeal-phase scoring parameters were assigned maximum impairment only because the bolus never reached the pharynx to trigger a swallow — the disorder was characterized as oral-phase-predominant, not a primary brainstem/pharyngeal-reflex lesion. Using the location and pattern of each lesion shown in the image, (1) state where each infarct (panel a and panel b) is located in standard neuroanatomical terms and what vascular territory or pattern each suggests, and (2) explain how infarcts in these two locations, rather than a brainstem lesion, could produce dysphagia that is disproportionately severe in the oral phase given that the oral phase depends on voluntary cortical control while the pharyngeal swallow reflex is coordinated mainly by brainstem centers.\nCase: A patient developed acute right-sided weakness, drowsiness, and impaired swallowing. Videofluoroscopy 3 months later showed severely impaired oral bolus formation and prolonged oral transit. No pharyngeal swallow was triggered because the bolus never reached the pharynx. Pharyngeal-phase parameters therefore received maximum impairment scores. The dysphagia was oral-phase-predominant rather than caused by a primary brainstem or pharyngeal-reflex lesion. The oral phase depends on voluntary cortical control, whereas brainstem centers mainly coordinate the pharyngeal swallow reflex.\n\nImages: Axial brain MRI shows two acute infarcts with high DWI and matching low ADC signal in different regions. Panel (a) is the left DWI–ADC pair, and panel (b) is the right pair.\n\nQuestion: What mechanism links the lesion locations and vascular patterns in panels (a) and (b) to the oral-phase-predominant dysphagia?"},{"id":"q02-5b7b12c75bf08dfa","specialty":"Gastroenterology/Thoracic Surgery","type":"Treatment Response","month":"2026-04","claude_score":3.0,"gemini_score":3.0,"title":"Large Epiphrenic Esophageal Diverticulum: An Unexpected Trap at the Distal Esophagus","image_count":2,"has_response":false,"search_text":"The same patient later underwent open (left thoracotomy) resection of the esophageal diverticulum combined with a Heller myotomy performed on the esophageal wall roughly opposite (180 degrees around the circumference from) the diverticulectomy site, extending from the lower chest down to the gastric wall. Esophageal manometry was never performed at any point in this patient's workup. The first provided image is the barium-swallow fluoroscopy study obtained before this operation; the second provided image is the barium-swallow fluoroscopy study obtained after the operation. Comparing the two images in that order, describe what changed and what persisted, and explain the clinical significance of the finding that persisted, including what it implies for this patient's ongoing risk and follow-up.\nCase: A patient underwent open esophageal diverticulectomy through a left thoracotomy with Heller myotomy. The myotomy was performed on the esophageal wall 180° opposite the diverticulectomy site and extended from the lower chest to the gastric wall. Esophageal manometry was not performed during the workup.\n\nImages: Image 1 is the preoperative barium-swallow fluoroscopy study. Image 2 is the postoperative study.\n\nQuestion: Based on the images and clinical history, what is the postoperative treatment response?"},{"id":"q02-602c53a9c474ecd9","specialty":"Nuclear Medicine/Musculoskeletal Oncologic Imaging","type":"Investigation Interpretation","month":"2026-07","claude_score":3,"gemini_score":3.0,"title":"Triple-Negative Inflammatory Metaplastic Breast Cancer Presenting as a Non-Mass Lesion","image_count":1,"has_response":false,"search_text":"The provided image shows two coronal whole-body panels from the same PET-CT study, shown side by side in the same orientation: left panel is the CT bone-window image, right panel is the FDG-PET image (dark/black foci indicate high tracer uptake). No fusion overlay is shown. Clinically, this patient had a breast malignancy with elevated tumor markers, axillary and supraclavicular lymphadenopathy, and had also developed several months of lower back pain before admission. Using only the pattern visible in the two panels together with this clinical history, characterize the type of bone lesions present (lytic versus sclerotic/blastic) and explain what the combination of the CT appearance and the corresponding PET uptake pattern implies about the biological activity and distribution of the skeletal disease.\nCase: A patient with breast malignancy has elevated tumor markers and axillary and supraclavicular lymphadenopathy. The patient had lower back pain for several months before admission.\n\nImages: Coronal whole-body images from the same PET-CT study are shown in the same orientation. The left panel is a CT bone-window image. The right panel is an FDG-PET image, where dark foci indicate high tracer uptake. No fusion overlay is provided.\n\nQuestion: How should the skeletal disease be characterized by its morphology, FDG activity, distribution, and clinical history?"},{"id":"q02-7cc647122a46df87","specialty":"Medical Genetics / Pediatric Endocrinology","type":"Investigation Interpretation","month":"2026-06","claude_score":3.0,"gemini_score":3.0,"title":"Central precocious puberty as the initial manifestation of multisystem involvement caused by de novo heterozygous KMT2B mutation and STS hemizygous deletion: a case report","image_count":1,"has_response":false,"search_text":"The provided image is a copy-number-variation plot from whole-exome sequencing of an affected boy. The x-axis lists individual exons (and some intronic/intergenic control probes) grouped by gene across a segment of the X chromosome; the y-axis is normalized genomic copy number, where a value near 1 is normal hemizygous copy number for a male and a value of 0 indicates complete deletion. This boy has a confirmed 46,XY karyotype, bilaterally descended testes of normal volume with no cryptorchidism, no anosmia, and a pubertal, gonadotropin-dependent (rather than hypogonadotropic) pattern on GnRH stimulation testing. Using the copy-number pattern shown, determine whether the deletion is confined to one gene or extends into neighboring genes, and explain why this distinction matters for reconciling this patient's phenotype.\nCase: Whole-exome sequencing of a boy produced the supplied copy-number-variation plot. The x-axis shows exons and some intronic or intergenic control probes grouped by gene across part of the X chromosome. A normalized copy number near 1 is normal for a hemizygous male; 0 indicates complete deletion.\n\nHe has a confirmed 46,XY karyotype and bilaterally descended testes of normal volume. He has no anosmia. GnRH stimulation shows a pubertal, gonadotropin-dependent rather than hypogonadotropic pattern.\n\nImages: The plot shows copy number across the labeled genes. The red arrow marks the region of interest.\n\nQuestion: Which deletion pattern accounts for both the CNV plot and the boy’s clinical phenotype?"},{"id":"q02-928520993d5ada32","specialty":"Neuro-oncology / Transplant Medicine","type":"Treatment Response","month":"2026-06","claude_score":3,"gemini_score":3.0,"title":"Case Report: Post-transplant lymphoproliferative disorder mimicking Baló’s concentric sclerosis","image_count":2,"has_response":false,"search_text":"The provided images are post-contrast axial MRI scans of the same intracranial lesion in a kidney-transplant recipient who was later confirmed to have an EBV-associated CNS lymphoproliferative disorder and was treated with a rituximab- and lenalidomide-based regimen alongside deliberate reduction of her antirejection immunosuppression: the first image was obtained at initial diagnosis (showing a ring-enhancing lesion with surrounding signal change); the second image was obtained about 8 months later, after treatment, at a comparable slice level. Over more than three years of subsequent follow-up the patient had no neurological relapse and her transplanted kidney continued to function normally. (a) Based on comparing the two images, characterize the treatment response as complete or partial remission and justify your choice. (b) State the key management principle that made this case different from treating an EBV-negative CNS lymphoma in a non-transplant patient, and explain the clinical tension this principle had to balance.\nCase: A kidney-transplant recipient was later confirmed to have an EBV-associated CNS lymphoproliferative disorder. She received a rituximab- and lenalidomide-based regimen while her antirejection immunosuppression was deliberately reduced. During more than three years of subsequent follow-up, she had no neurological relapse, and her transplanted kidney continued to function normally.\n\nImages: Both images are post-contrast axial brain MRIs of the same intracranial lesion. Image 1 was obtained at diagnosis and shows a ring-enhancing lesion with surrounding signal change. Image 2 was obtained about eight months after treatment at a comparable slice level.\n\nQuestion: Based on the two MRIs, is the response a complete or partial remission?"},{"id":"q02-9e748ec1b707a6b9","specialty":"Interventional Neuroradiology / Head and Neck Oncology","type":"Treatment Response","month":"2026-07","claude_score":3,"gemini_score":3.0,"title":"Bilateral internal carotid artery occlusion following embolization of the right internal carotid artery in a nasopharyngeal carcinoma with massive bleeding: a case report","image_count":2,"has_response":false,"search_text":"A woman with irradiated nasopharyngeal carcinoma and massive nasal bleeding underwent emergency catheter angiography, which identified an outpouching (pseudoaneurysm) arising from the C3 segment of the right internal carotid artery (ICA); the right internal and external carotid arteries were also noted to be significantly narrowed at this time. This lesion was treated urgently with spring-coil embolization. The two provided images show the same right ICA region, in this order: first image — obtained immediately before the endovascular procedure; second image — obtained after the endovascular procedure. A red arrow marks the corresponding treated site in both images.\n\nCompare the two images and state: (a) the specific change that occurred at the marked site between the first and second image, and (b) what this change indicates about both the adequacy of hemostasis and the patency of the parent right ICA after treatment.\nCase: A woman with irradiated nasopharyngeal carcinoma developed massive nasal bleeding. Emergency catheter angiography showed an outpouching (pseudoaneurysm) arising from the C3 segment of the right internal carotid artery (ICA). The right internal and external carotid arteries were significantly narrowed. She underwent urgent coil embolization.\n\nImages: The first image shows the right ICA immediately before embolization. The second shows the same region afterward. Red arrows mark the treated site.\n\nQuestion: What changed at the marked site, and what does this indicate about hemostasis and parent right ICA patency?"},{"id":"q03-243a75f7c895befa","specialty":"Rheumatology / Nephrology","type":"Treatment Response","month":"2026-04","claude_score":3.0,"gemini_score":3.0,"title":"Severe Polyarticular gout mimicking sepsis after acute kidney injury: a case report","image_count":1,"has_response":false,"search_text":"The provided image shows two graphs from the same patient's hospitalization, both plotted over identical dates from admission to a follow-up visit roughly two weeks later: the top graph is serum CRP and the bottom graph is serum creatinine. On both graphs, arrow 1 marks the day naproxen (an anti-inflammatory) was started, and arrow 2 marks the day colchicine was added afterward, because joint symptoms were progressing despite naproxen. No change in antibiotics occurred around either arrow. Using only the trends shown in the image: (a) had renal function already substantially recovered from its worst point by the time naproxen (arrow 1) was started, or was the kidney injury still near its most severe? (b) did the sharp fall in CRP occur mainly before or after colchicine (arrow 2) was added? Then explain what this timing implies about which intervention was primarily responsible for the marked improvement in inflammatory markers, and what the small late upticks in both values after their lowest point most likely represent.\nCase: The figure shows serum CRP (top) and creatinine (bottom) over the same dates, from admission to follow-up about two weeks later. Arrow 1 marks when naproxen, an anti-inflammatory drug, was started. Arrow 2 marks when colchicine was later added because joint symptoms progressed despite naproxen. Antibiotics were unchanged around both arrows.\n\nQuestion: What do the trends show about renal recovery at arrow 1, the timing and likely treatment cause of the CRP decline, and both late upticks?"},{"id":"q03-422cabd63590dc60","specialty":"Pediatric Orthopedic Surgery / Musculoskeletal Radiology","type":"Investigation Interpretation","month":"2026-05","claude_score":3,"gemini_score":3.0,"title":"Open Distal Femoral Physeal Fracture in a 6-Year-Old Child Complicated by Growth Arrest and Limb-Length Discrepancy: A Case Report","image_count":1,"has_response":false,"search_text":"The provided image is a single cropped anteroposterior knee radiograph obtained 2 months after surgical fixation of an open, high-energy growth-plate fracture of the distal femur in a young child. Two different sets of arrow markers were placed on the original image by the radiology/surgical team: one set (lower arrows, pointing upward into the bone just above the joint) marks one finding, and a second set (arrows along the shaft, pointing toward the bone edge) marks a different, separate finding. Based on the appearance of the bone at each marked site, describe what each set of arrows is most likely highlighting, and explain why the combination of these two findings at this early 2-month time point is clinically concerning for this patient's future limb growth.\nCase: A young child underwent surgical fixation of an open, high-energy distal femoral growth-plate fracture. This anteroposterior knee radiograph was obtained 2 months later.\n\nImages: The lower arrows point upward to the bone just above the joint. The shaft arrows point toward the bone edge. Each set marks a separate finding.\n\nQuestion: What does each arrow set show, and why are these findings concerning for future limb growth?"},{"id":"q03-becc4fdbf2b652ba","specialty":"Parasitology / Medical Entomology","type":"Diagnosis","month":"2026-05","claude_score":3,"gemini_score":3.0,"title":"Furuncular myiasis by Cordylobia anthropophaga in three Italian children: First case series and implications for non-endemic regions","image_count":2,"has_response":false,"search_text":"Larvae were recovered from furuncular skin lesions in two unrelated pediatric patients who had both traveled to Senegal. Morphological species identification relied on two features shown in the provided images: the first image shows the overall body surface spine pattern of one of the larvae, and the second image shows a close-up of its two posterior respiratory spiracles. Each larva measured 7.5-8.0 mm long. Two closely related blowfly species cause this type of furuncular myiasis in sub-Saharan Africa and are distinguished mainly by the shape of the posterior spiracular slits: one species has very wavy (deeply undulating) slits, while the other has only gently sinusoidal slits. Based on the slit morphology visible in the second image, state which of the two species these larvae most likely belong to, and explain what the discrepancy between the pattern in the first image and the feature in the second image indicates about the larvae's developmental stage at the time of extraction.\nCase: Larvae measuring 7.5–8.0 mm were recovered from furuncular skin lesions in two unrelated children who had traveled to Senegal. Two closely related blowfly species cause this form of myiasis in sub-Saharan Africa. One species has deeply undulating posterior spiracular slits, whereas the other has gently sinusoidal slits.\n\nImages: The first image shows the body-surface spine pattern of one larva. The second image shows its two posterior respiratory spiracles.\n\nQuestion: What species and developmental-stage transition do these findings indicate?"},{"id":"q03-febed7ddb3fb00fb","specialty":"Neurosurgery / Intracranial Pressure Physiology","type":"Mechanism","month":"2026-06","claude_score":3,"gemini_score":3.0,"title":"The Pathophysiology of Sinking Flap Syndrome Associated with Low-Pressure Hydrocephalus: A Case Study Suggests a New Hypothesis","image_count":1,"has_response":false,"search_text":"During a sinking flap syndrome episode following decompressive craniectomy, a 19.2 mm midline shift of the brain was present. The collapsed skin flap over the cranial defect had a sigmoid shape with an upper concave segment and a lower convex segment; physical reasoning dictates that at the point where the flap's curvature reverses from concave to convex (the inflection point), the intracranial pressure (ICP) must equal atmospheric pressure (0 relative to atmosphere) - above this point ICP is below atmospheric (producing concavity, i.e., the flap is drawn inward), and below this point ICP is above atmospheric (producing convexity, i.e., the flap bulges outward). The provided image shows, on the left, an axial CT slice through the flap at this time with the inflection point marked by an arrow, and on the right, a 3D skull reconstruction in which an arrow marks the same inflection point's vertical level, a horizontal reference line marks the level of the external auditory meatus (EAM), and a labeled vertical distance shows that the inflection point lies 5 cm above this EAM reference line. Assuming CSF has a hydrostatic pressure gradient of approximately 0.735 mmHg per cm of vertical height (similar to water), calculate the estimated ICP at the level of the EAM, state whether this value is above or below atmospheric pressure, and explain what this implies about whether the brain was being pushed inward by atmospheric pressure or pulled inward by a primary loss of CSF volume.\nCase: During an episode of sinking flap syndrome after decompressive craniectomy, the brain had a 19.2 mm midline shift. The collapsed skin flap over the cranial defect was sigmoid, with an upper concave segment and a lower convex segment. At the inflection point where its curvature reverses, ICP equals atmospheric pressure (0 mmHg relative). ICP is below atmospheric above this point and above atmospheric below it. Assume a CSF hydrostatic pressure gradient of 0.735 mmHg/cm.\n\nImages: Panel A is an axial CT image from this episode; the arrow marks the flap's inflection point. Panel B is a 3D skull reconstruction; the arrow marks the same vertical level. The horizontal line marks the level of the external auditory meatus (EAM), which is 5 cm below the inflection point.\n\nQuestion: What does the estimated ICP at the EAM show about the mechanism of inward brain displacement?"},{"id":"q01-38c704a402bdd4c0","specialty":"Neurology (Electrodiagnostics)","type":"Investigation Interpretation","month":"2026-03","claude_score":3,"gemini_score":3.0,"title":"Successful Recovery From Ischemic Monomelic Neuropathy After Delayed Ligation and Plication of Dialysis Access: A Case Report and Review of Literature","image_count":0,"has_response":true,"search_text":"A woman in her 80s on maintenance hemodialysis had a right radiocephalic AV fistula that had already been judged unusable for dialysis, and, months later, a new right brachio-axillary AV graft. After the graft was placed she developed severe pain, numbness, and progressive weakness of that hand, eventually with 2/5 finger strength and inability to make a fist.\n\nNerve conduction studies of the right arm showed: no sensory or motor response at all in the median nerve; no sensory response in the radial nerve; and in the ulnar nerve, a low-amplitude but present sensory response with normal conduction velocity, and motor (CMAP) amplitudes that were reduced but present and essentially unchanged across wrist, elbow, and above-elbow stimulation sites, again with a normal conduction velocity. In contrast, the right medial and lateral antebrachial cutaneous sensory nerves - purely sensory branches that arise from the brachial plexus higher up the arm - were completely normal. All left-arm (unaffected side) median, ulnar, and radial sensory and motor studies were also entirely normal, despite the patient having long-standing type 2 diabetes mellitus. Needle EMG of the intrinsic hand muscles showed reduced insertional activity and reduced recruitment, with no fibrillations or other spontaneous denervation potentials reported.\n\nUsing only this electrodiagnostic pattern: (1) state which segment of the affected nerves is involved, and explain why the sparing of the antebrachial cutaneous nerves and the completely normal contralateral studies each argue against the two most obvious alternative explanations for new hand neuropathy in a diabetic patient after arm surgery; and (2) state whether this pattern favors reversible ischemic conduction dysfunction or irreversible axonal degeneration as the dominant process, and justify your answer using the specific findings above.\nCase: A woman in her 80s on hemodialysis had an unusable right radiocephalic AV fistula and later received a right brachio-axillary AV graft. After graft placement, she developed severe hand pain, numbness, and progressive weakness, reaching 2/5 finger strength with inability to make a fist.\n\nElectrodiagnostic findings:\n- Right median nerve: no sensory or motor response.\n- Right radial nerve: no sensory response.\n- Right ulnar nerve: low-amplitude but present sensory response with normal velocity; reduced but present motor amplitudes that were essentially unchanged with wrist, elbow, and above-elbow stimulation, with normal velocity.\n- Right medial and lateral antebrachial cutaneous sensory nerves, which branch higher from the brachial plexus, were normal.\n- All left median, ulnar, and radial sensory and motor studies were normal despite longstanding type 2 diabetes.\n- Needle EMG of intrinsic hand muscles showed reduced insertional activity and recruitment, without fibrillations or other spontaneous denervation potentials.\n\nQuestion: (1) Localize the affected nerve segments and explain how antebrachial cutaneous sparing and normal contralateral studies argue against the two main alternatives for postoperative hand neuropathy in a diabetic patient. (2) Does the pattern favor reversible ischemic conduction dysfunction or irreversible axonal degeneration, and which findings support that choice?"},{"id":"q01-840ae4270c407003","specialty":"Radiation Oncology / Colorectal Oncology","type":"Treatment Response","month":"2026-03","claude_score":3,"gemini_score":3.0,"title":"Diagnosis and Management of Synchronous Prostate and Rectal Cancer in a Patient","image_count":0,"has_response":true,"search_text":"A patient with locally advanced rectal adenocarcinoma (baseline: semicircumferential anterior rectal wall lesion with several involved mesorectal/pelvic lymph nodes) received total neoadjuvant chemoradiotherapy, then interval chemotherapy. This was coordinated with androgen deprivation therapy (ADT) started for a separately diagnosed, biopsy-proven intermediate-risk prostate adenocarcinoma. Serum CEA had already been within the normal range (about 3 ng/mL) before any treatment began.\n\nAt a follow-up visit after completing the rectal chemoradiotherapy and chemotherapy, digital rectal exam and endoscopy showed complete intraluminal regression of the rectal tumor with no palpable or visible mass. However, pelvic MRI obtained at the same visit showed a small residual T2-weighted signal focus with restricted diffusion at the primary tumor site (no new or persistently enlarged lymph nodes were described). Serum PSA, drawn while the patient was still on ADT, was <0.1 ng/mL, and CEA remained in the normal range.\n\n(1) Do these findings meet standard criteria for a complete clinical response of the rectal cancer, and what is the single most appropriate next management step? (2) Explain specifically why the PSA and CEA results do not help confirm that the rectal tumor has completely resolved.\nCase: A patient had locally advanced rectal adenocarcinoma, with a semicircumferential anterior rectal wall lesion and several involved mesorectal and pelvic lymph nodes. The patient received total neoadjuvant chemoradiotherapy followed by interval chemotherapy.\n\nThe patient also had biopsy-proven intermediate-risk prostate adenocarcinoma and received concurrent androgen deprivation therapy (ADT). Before any treatment, serum CEA was normal at about 3 ng/mL.\n\nAfter completing rectal chemoradiotherapy and chemotherapy, digital rectal examination and endoscopy showed complete intraluminal regression, with no palpable or visible mass. At the same visit, pelvic MRI showed a small residual T2-weighted signal focus with restricted diffusion at the primary tumor site. No new or persistently enlarged lymph nodes were described. While the patient remained on ADT, serum PSA was <0.1 ng/mL, and CEA remained normal.\n\nQuestion: What is the most appropriate next step in managing the rectal cancer?"},{"id":"q02-012376ea14fef0a5","specialty":"Musculoskeletal Radiology","type":"Mechanism","month":"2026-06","claude_score":3,"gemini_score":3.0,"title":"Delayed Diagnosis of an Occult Femoral Neck Fracture Undetected by MRI and Dual-Energy CT: A Case Report","image_count":0,"has_response":false,"search_text":"A patient with a disorder that increases bone marrow cellularity is being worked up for a possible occult hip fracture. Conventional MRI shows diffusely low T1 marrow signal without a clear focal high-signal area on fat-suppressed T2 imaging, so it is unclear whether this represents disease-related marrow change or a subtle missed fracture. Two additional quantitative MRI-based techniques can help distinguish these possibilities: (1) opposed-phase (chemical-shift) imaging with calculation of a signal-intensity drop ratio, and (2) diffusion-weighted imaging with apparent diffusion coefficient (ADC) mapping. For each technique, state the physiological mechanism and describe what result would be expected if the marrow abnormality were truly due to increased hematopoietic marrow cellularity (disease-related) rather than acute fracture-related edema.\nCase: A patient with a disorder that increases bone marrow cellularity is evaluated for a possible occult hip fracture. Conventional MRI shows diffusely low T1 marrow signal and no clear focal high-signal area on fat-suppressed T2 imaging. It is unclear whether these findings reflect disease-related marrow change or a subtle missed fracture.\n\nTwo additional quantitative MRI techniques may help:\n\n- opposed-phase (chemical-shift) imaging with calculation of a signal-intensity drop ratio\n- diffusion-weighted imaging with apparent diffusion coefficient (ADC) mapping\n\nQuestion: For each technique, what mechanism and result would support disease-related hypercellular marrow rather than acute fracture edema?"},{"id":"q02-08cb4222ff6b7f1c","specialty":"Dermatology/Immunology","type":"Mechanism","month":"2026-05","claude_score":3,"gemini_score":3.0,"title":"Entecavir-Induced Lichenoid Drug Eruption: A Case Report","image_count":0,"has_response":false,"search_text":"In this same patient, the drug implicated in the lichenoid eruption was a nucleos(t)ide analog antiviral used for chronic hepatitis B. The discussion of comparable published cases describes two proposed immunologic mechanisms for cutaneous eruptions triggered by this drug class: one group found a decrease in one lymphocyte subset paired with an increase in a cytokine-producing T-helper subset early in treatment, and another group measured cytokine levels after drug exposure and found one interleukin was significantly elevated at 18 and 24 hours (with several other cytokines also numerically elevated but not reaching statistical significance). Name the lymphocyte subset that was reported to decrease, the T-helper subset/cytokine axis proposed to increase in its place, and the single interleukin that was found to be significantly elevated in the cytokine release assay.\nCase: The implicated drug was a nucleos(t)ide analog antiviral used for chronic hepatitis B. Comparable cases proposed two immune mechanisms for cutaneous eruptions from this drug class.\n\nEarly in treatment, one study found a decrease in one lymphocyte subset and an increase in a cytokine-producing T-helper subset. Another study found that one interleukin was significantly elevated at 18 and 24 hours after drug exposure. Several other cytokines were numerically elevated but not statistically significant.\n\nQuestion: Which decreased lymphocyte subset, increased T-helper/cytokine axis, and significantly elevated interleukin were reported?"},{"id":"q02-2f31d8ea9c96bf14","specialty":"Clinical Pharmacology / Lactation Pharmacokinetics","type":"Treatment","month":"2026-05","claude_score":3,"gemini_score":3.0,"title":"Transfer of trastuzumab and pertuzumab into human breast milk: a case report","image_count":0,"has_response":false,"search_text":"A woman received IV trastuzumab 600 mg and pertuzumab 1200 mg in a single treatment cycle. Breast milk was collected once daily whenever it was produced over the following 17 days (production was absent, and no sample obtained, on 3 of those 17 days), and drug concentrations were measured. For each drug, a relative infant dose (RID) was calculated for every sampled day by dividing the estimated infant daily dose by the maternal dose; the infant daily dose was estimated by multiplying the measured milk concentration by a standard exclusively-breastfed intake volume of 150 mL per kg of infant body weight per day (a WHO-defined reference value), and the daily RIDs were summed into a cumulative RID for the cycle. In this patient, however, actual daily milk production was only about 5-10 mL total (far below typical exclusive-breastfeeding volumes), attributed to a concurrent oral endocrine therapy that suppresses lactation. Separately, an unrelated in-vitro study simulating infant gastrointestinal digestion of a milk-borne IgG1 antibody showed roughly 57% loss of antibody activity after digestion. The resulting cumulative RIDs were 16.8% for trastuzumab and 24.3% for pertuzumab, both above the conventional 10% RID safety threshold used for small-molecule drugs.\n\nIdentify: (a) one factor in this scenario that would make the calculated ingested dose (and hence RID) an overestimate of what the infant could actually have consumed from this breast, (b) one factor that would make the summed cumulative RID an underestimate of the drug excreted into milk over the full 17 days, and (c) one factor that could make true infant systemic absorption lower than the calculated ingested dose implies. Then state what breastfeeding recommendation this body of evidence supports and why.\nCase: A woman received one IV cycle of trastuzumab 600 mg and pertuzumab 1200 mg. Milk was collected once daily when produced over 17 days; no milk or sample was obtained on 3 days. For each sampled day, estimated infant dose equaled milk concentration × the WHO reference intake of 150 mL/kg/day for exclusive breastfeeding. Dividing this estimate by maternal dose gave daily relative infant dose (RID), and daily RIDs were summed for the cycle.\n\nHer actual milk production was only 5–10 mL/day, attributed to concurrent oral endocrine therapy that suppresses lactation. An unrelated in-vitro infant-digestion study of a milk-borne IgG1 antibody found about 57% loss of antibody activity. Cumulative RIDs were 16.8% for trastuzumab and 24.3% for pertuzumab, both above the conventional 10% small-molecule safety threshold.\n\nQuestion: Identify (a) one reason calculated ingestion could overestimate what this infant consumed, (b) one reason cumulative RID could underestimate drug excretion into milk over 17 days, and (c) one reason systemic absorption could be lower than calculated ingestion. Then state the supported breastfeeding recommendation and why."},{"id":"q02-39fcd63b0c85a910","specialty":"Hematology/Oncology","type":"Investigation Interpretation","month":"2026-04","claude_score":3,"gemini_score":3.0,"title":"Secondary Hemophagocytic Lymphohistiocytosis Presenting As the Initial Manifestation of Diffuse Gastric Signet Ring Cell Adenocarcinoma: A Case Report","image_count":0,"has_response":false,"search_text":"An adult presented with fever, hepatomegaly, and bicytopenia (anemia and thrombocytopenia). Laboratory testing showed ferritin markedly above 6,000 ng/mL, triglycerides above the threshold used in hyperinflammation scoring, and mildly elevated AST, with no known immunosuppression. Fibrinogen was not measured, and a bone marrow biopsy could not be assessed for hemophagocytosis because the sample showed extensive necrosis with no viable cellularity - two parameters that would normally contribute points to a validated hyperinflammatory (HScore-type) probability score. (a) Explain why the combined weight of the remaining measured parameters alone was still sufficient to place this patient's probability of a reactive hemophagocytic syndrome in the 80-88% range despite these two missing/unassessable inputs. (b) The same necrotic marrow sample was nonetheless informative: state what type of ancillary study on that sample, and what result, pointed toward the specific underlying trigger for the syndrome.\nCase: An adult had fever, hepatomegaly, anemia, and thrombocytopenia. Ferritin was above 6,000 ng/mL, triglycerides exceeded the hyperinflammation-score threshold, and AST was mildly elevated. There was no known immunosuppression.\n\nFibrinogen was not measured. Extensive bone marrow necrosis with no viable cells prevented assessment for hemophagocytosis. These two inputs therefore could not contribute to a validated HScore-type probability score. The remaining measured parameters still indicated an 80–88% probability of a reactive hemophagocytic syndrome.\n\nQuestion: Why were the measured parameters sufficient to produce this probability?"},{"id":"q02-50b36fd691d29dcb","specialty":"Cardiovascular Surgery / Multidisciplinary Oncology","type":"Treatment","month":"2026-07","claude_score":3,"gemini_score":3.0,"title":"Right atrial rupture due to cardiac angiosarcoma without haemodynamic collapse: a case report of successful multidisciplinary management","image_count":0,"has_response":false,"search_text":"A right atrial tumour extended widely along the atrial wall without forming a discrete mass, and a separate mass at the left ventricular apex did not reach the endocardial surface. The patient also had peripherally located pulmonary nodules, and there was a fistulous communication allowing free flow of blood from the right atrium into the pericardial space. A multidisciplinary team needed a tissue diagnosis to justify chemotherapy for a highly aggressive suspected malignancy. Explain, for at least three distinct candidate biopsy or sampling approaches, the specific anatomic or safety reason each was rejected, and state which approach was ultimately used to obtain the diagnosis.\nCase: A right atrial tumour extended widely along the atrial wall without forming a discrete mass. A separate left ventricular apical mass did not reach the endocardial surface. The patient also had peripheral pulmonary nodules. A fistula allowed free blood flow from the right atrium into the pericardial space.\n\nThe clinical team needed tissue confirmation before giving chemotherapy for a suspected highly aggressive malignancy.\n\nQuestion: For at least three candidate biopsy or sampling approaches, what specific anatomic or safety constraint led to rejection, and which approach obtained the diagnosis?"},{"id":"q02-5aed8fb704bac3a1","specialty":"Endocrine Oncology/Gastroenterology","type":"Mechanism","month":"2026-05","claude_score":3,"gemini_score":3.0,"title":"Diagnostic Challenge of Small Bowel Neuroendocrine Tumour Mimicking Biliary Disease: A Case Report","image_count":0,"has_response":false,"search_text":"The resected ileal tumour in this patient was confirmed as a well-differentiated Grade 1 neuroendocrine tumour with a Ki-67 proliferation index of less than 3%. Pathology showed the tumour cells extending deep into the muscularis propria with focal invasion of the subserosa, prominent lymphovascular space invasion, and 3 of 5 sampled mesenteric lymph nodes involved by tumour. Despite this degree of local and nodal invasion, the patient never developed flushing, diarrhea, or any other hormone-mediated symptom, and a full panel of secretory biomarkers (chromogranin A and B, 5-HIAA, VIP, somatostatin, and catecholamines/metabolites) remained within normal limits throughout her presentation and postoperative course. Explain the mechanism by which this tumour produced acute small bowel obstruction despite this biochemical profile, and explain why the normal marker levels did not exclude the presence of a neuroendocrine tumour.\nCase: The resected ileal tumour was a well-differentiated Grade 1 neuroendocrine tumour with a Ki-67 index below 3%. Pathology showed tumour cells extending deep into the muscularis propria, with focal subserosal and prominent lymphovascular invasion. Three of five sampled mesenteric lymph nodes contained tumour.\n\nThe patient developed acute small bowel obstruction but never had flushing, diarrhea, or other hormone-mediated symptoms. Chromogranin A and B, 5-HIAA, VIP, somatostatin, catecholamines, and their metabolites remained normal during presentation and after surgery.\n\nQuestion: What mechanism explains both the acute obstruction and the persistently normal secretory biomarker profile?"},{"id":"q02-75feb30eed5df3bf","specialty":"Interventional Cardiology","type":"Mechanism","month":"2026-03","claude_score":3.0,"gemini_score":3.0,"title":"Successful Management of a Complex Coronary Bifurcation Lesion in Acute Coronary Syndrome Using a Free‐Metal Approach","image_count":0,"has_response":true,"search_text":"During attempted guidewire crossing of a severely tortuous circumflex artery bifurcation (with an angle exceeding 270 degrees between a marginal branch and the proximal vessel), a standard antegrade approach using an over-the-wire balloon to advance the wire distally into the branch failed on the first attempt. A second, alternative wiring strategy succeeded on the next attempt without any change in equipment stiffness or tip shape and without additional debulking of the lesion. Name the general category of wiring strategy most likely used, and explain the biomechanical principle by which it can succeed in an angle too acute for straightforward antegrade wire advancement.\nCase: A standard antegrade guidewire could not cross a severely tortuous circumflex artery bifurcation. The angle between a marginal branch and the proximal vessel exceeded 270°. An over-the-wire balloon was used to advance the wire distally into the branch. On the next attempt, an alternative wiring strategy succeeded. Equipment stiffness and tip shape were unchanged, and no additional lesion debulking was performed.\n\nQuestion: What biomechanical mechanism explains the success of the alternative wiring strategy?"},{"id":"q02-78b92c25e63e5b1a","specialty":"Pulmonology/Hematology-Oncology","type":"Complication","month":"2026-04","claude_score":3,"gemini_score":3.0,"title":"Nintedanib combined with anticoagulant therapy in advanced lung cancer complicated with pulmonary fibrosis and pulmonary embolism: two case reports and clinical decision-making analysis","image_count":0,"has_response":false,"search_text":"A second patient with lung adenocarcinoma and drug-related interstitial lung disease was being treated with a VEGFR-inhibiting antifibrotic drug together with a therapeutic-dose low-molecular-weight heparin started for a newly diagnosed pulmonary embolism. About a week into this combined treatment he developed new mild hemoptysis (a few streaks of blood in sputum per day) without other new symptoms. Repeat coagulation testing at that time showed a normal fibrinogen level, a prolonged APTT, and a D-dimer that had fallen sharply from its admission value to a near-normal level. Using this lab pattern together with the clinical picture, explain what it indicates about whether the new bleeding reflects failure of anticoagulation or a separate drug effect, and describe the management step that was actually appropriate given this pattern (i.e., what should be done to the antifibrotic drug and the anticoagulant, respectively).\nCase: A patient with lung adenocarcinoma and drug-related interstitial lung disease was receiving a VEGFR-inhibiting antifibrotic drug. Therapeutic-dose low-molecular-weight heparin was started for a newly diagnosed pulmonary embolism.\n\nAbout one week after combined treatment began, the patient developed mild hemoptysis, with a few blood streaks in the sputum each day. There were no other new symptoms.\n\nRepeat testing showed a normal fibrinogen level, prolonged APTT, and a D-dimer level that had fallen sharply from admission to near normal.\n\nQuestion: Does the hemoptysis indicate anticoagulation failure or a separate drug-related bleeding effect?"},{"id":"q02-83c2d6d1c8bf867a","specialty":"Clinical Pharmacology/Psychiatry","type":"Mechanism","month":"2026-06","claude_score":3,"gemini_score":3.0,"title":"A Rare Case of Hypothermia Due to Quetiapine Use","image_count":0,"has_response":false,"search_text":"An elderly man with dementia had been maintained on a stable dose of an atypical antipsychotic for years, with no recent dose change and no new interacting medications, when he developed progressive hypothermia (temperature nadir around 91°F) partway through a hospitalization for pneumonia and severe hypernatremia. Thyroid-stimulating hormone, morning cortisol, and glucose were normal both at admission and during the hypothermic episode, and there was no sepsis or cold exposure. His temperature and heart rate normalized within hours of holding the drug. Explain the receptor-level pharmacologic mechanism(s) by which this drug class can produce hypothermia, and explain why this reaction can emerge during an acute illness even though the drug and dose had been unchanged for years.\nCase: An elderly man with dementia had taken a stable dose of an atypical antipsychotic for years. There had been no recent dose change or new interacting medication.\n\nDuring hospitalization for pneumonia and severe hypernatremia, he developed progressive hypothermia, with a temperature nadir of about 91°F. Thyroid-stimulating hormone, morning cortisol, and glucose were normal at admission and during the hypothermic episode. There was no sepsis or cold exposure. His temperature and heart rate normalized within hours after the drug was held.\n\nQuestion: What receptor-level and illness-related mechanisms explain this hypothermia despite years on an unchanged dose?"},{"id":"q02-a4294df4a88a0a7e","specialty":"Pediatric Infectious Disease / Clinical Microbiology","type":"Investigation Interpretation","month":"2026-04","claude_score":3,"gemini_score":3.0,"title":"Candida dubliniensis as a Cause of Chronic Meningitis in a 3-Year-Old Boy with Acute Lymphoblastic Leukemia","image_count":0,"has_response":false,"search_text":"In a child with leukemia-associated Candida CNS infection, antifungal susceptibility testing of the isolate at the first episode showed amphotericin B MIC 0.023 mg/L and fluconazole MIC 0.38 mg/L. At clinical recurrence roughly six months later, the same species was again isolated from CSF, now with amphotericin B MIC 0.47 mg/L, fluconazole MIC 2 mg/L, and voriconazole MIC 0.047 mg/L. Based only on these values, which of the two originally used drugs (amphotericin B or fluconazole) moved proportionally further from its baseline MIC, and which drug's absolute MIC at recurrence is most consistent with crossing into a range of clinical concern for Candida species (rather than remaining comfortably susceptible)? State the clinical decision this pattern supports.\nCase: A child with leukemia-associated Candida CNS infection had an initial isolate with amphotericin B MIC 0.023 mg/L and fluconazole MIC 0.38 mg/L.\n\nAbout six months later, the infection recurred. The same Candida species was isolated from CSF with amphotericin B MIC 0.47 mg/L, fluconazole MIC 2 mg/L, and voriconazole MIC 0.047 mg/L.\n\nQuestion: What antifungal treatment decision does this MIC pattern support?"},{"id":"q02-a4a97704eeb823c5","specialty":"Immunology/Autoantibody Diagnostics","type":"Investigation Interpretation","month":"2026-05","claude_score":3,"gemini_score":3.0,"title":"Case Report: Two atypical cases of M6-like antimitochondrial antibody pattern unlinked to iproniazid","image_count":0,"has_response":false,"search_text":"A serum sample is tested by indirect immunofluorescence on rat liver, kidney, and stomach tissue sections. The pattern observed is: coarse granular cytoplasmic fluorescence of hepatocytes; bright fluorescence confined to the initial (proximal) segment of the renal tubules only, sparing the rest of each tubule; and fluorescence of scattered individual cells within the gastric mucosa, a distribution consistent with diffuse neuroendocrine (enterochromaffin/APUD) cells rather than diffuse staining of the acid-secreting glandular cells. Testing on HEp-2 cells shows no specific reticular or other characteristic cytoplasmic pattern, and a separate immunodot assay for the M2-subtype antimitochondrial antibody, anti-smooth-muscle antibody, anti-Liver Kidney Microsome, anti-Liver Cytosol-1, and anti-Soluble Liver Antigen antibodies is negative. Pancreatic islet cells are not stained.\n\nWhich antimitochondrial antibody subtype does this staining pattern most closely match, and name two immunofluorescence features (each tied to a specific organ/cell type) that would distinguish this pattern from the more common M2 subtype examined on the same rat tissue substrates?\nCase: A serum sample is tested by indirect immunofluorescence on rat liver, kidney, and stomach sections. Hepatocytes show coarse granular cytoplasmic fluorescence. Bright fluorescence is limited to the initial proximal segments of renal tubules, with the remaining tubules spared. Scattered enterochromaffin/APUD cells in the gastric mucosa fluoresce. This differs from diffuse staining of acid-secreting glandular cells. Pancreatic islet cells are not stained.\n\nHEp-2 cells show no specific reticular or other characteristic cytoplasmic pattern. An immunodot assay is negative for M2 antimitochondrial, smooth-muscle, Liver Kidney Microsome, Liver Cytosol-1, and Soluble Liver Antigen antibodies.\n\nQuestion: Which antimitochondrial antibody subtype best matches this pattern?"},{"id":"q02-be904ba29c13b9e6","specialty":"Pediatric Hematology/Immunology","type":"Mechanism","month":"2026-06","claude_score":3,"gemini_score":3.0,"title":"Case Report: Primary hemophagocytic lymphohistiocytosis with a homozygous PRF1 variant: a case suggesting early immunoporosis and an expanded phenotypic spectrum","image_count":0,"has_response":false,"search_text":"A patient later diagnosed with primary HLH initially presented with 8 days of fever, splenomegaly, and pancytopenia (hemoglobin 7.5 g/dL, platelets 49x10^9/L, absolute neutrophil count 0.7x10^9/L) plus reticulocytosis (5.9%) and a bone marrow showing 70% cellularity with erythroid hyperplasia and hemophagocytosis, without evidence of thrombotic microangiopathy. At this same presentation, ferritin was only 142.6 ng/mL (not markedly elevated), while triglycerides (191 mg/dL), soluble IL-2 receptor (3,776.6 pg/mL), and CXCL9 (6,892 pg/mL) were elevated. Explain (1) why the near-normal ferritin at this point does not argue against active HLH, and (2) what mechanism most likely accounts for the reticulocytosis and erythroid hyperplasia given the absence of thrombotic microangiopathy.\nCase: A patient later diagnosed with primary HLH initially presented after 8 days of fever. The patient had splenomegaly and pancytopenia: hemoglobin 7.5 g/dL, platelets 49 × 10^9/L, and absolute neutrophil count 0.7 × 10^9/L. The reticulocyte count was 5.9%. Bone marrow examination showed 70% cellularity, erythroid hyperplasia, and hemophagocytosis. There was no evidence of thrombotic microangiopathy.\n\nAt this presentation, ferritin was only 142.6 ng/mL. Triglycerides were 191 mg/dL, soluble IL-2 receptor was 3,776.6 pg/mL, and CXCL9 was 6,892 pg/mL.\n\nQuestion: What mechanisms explain the near-normal ferritin and the reticulocytosis with erythroid hyperplasia?"},{"id":"q02-c510db55125e42ff","specialty":"Gastroenterology/Pancreatic Surgery","type":"Mechanism","month":"2026-05","claude_score":3.0,"gemini_score":3.0,"title":"Acinar Cell Cystadenoma: A Case Report and Literature Review","image_count":0,"has_response":false,"search_text":"For this same benign pancreatic cystic lesion, endoscopic ultrasound-guided fine needle aspiration was deferred in favor of upfront resection because of the patient's symptoms and radiologically suspicious features. The literature on preoperative endoscopic biopsy of this lesion type notes that diagnostic accuracy depends heavily on which tissue component is captured in the sample. Explain the specific histological reason a limited or non-representative preoperative biopsy of this lesion could be misinterpreted as a different, much more common benign pancreatic condition rather than correctly recognized, and name that alternative condition.\nCase: Because the patient had symptoms and radiologically suspicious features, endoscopic ultrasound-guided fine-needle aspiration was deferred and the benign pancreatic cystic lesion was resected. Preoperative biopsy accuracy for this lesion depends on sampling the correct tissue component. A limited or nonrepresentative sample could resemble a more common benign pancreatic condition.\n\nQuestion: What histologic sampling problem could cause this misinterpretation?"},{"id":"q02-c83a682ecff4b4ed","specialty":"Maternal-Fetal Medicine","type":"Prognosis","month":"2026-05","claude_score":3,"gemini_score":3.0,"title":"Spontaneous Uterine Artery Rupture in Pregnancy, With Subsequent Severe Foetal Intracranial Haemorrhage","image_count":0,"has_response":false,"search_text":"In the same pregnancy described above, a follow-up scan performed a few weeks after the one showing marked ventricular enlargement confirmed the ventricular findings were unchanged, but also showed that the fetal abdominal circumference had fallen from around the 50th percentile to below the 3rd percentile over that interval. Umbilical/placental Doppler studies remained normal throughout this same period. Explain the most likely reason for this drop in abdominal circumference in this clinical context, and why persistently normal Doppler does not rule out this explanation.\nCase: In the same pregnancy, a follow-up scan was performed a few weeks after marked fetal ventricular enlargement was found. The ventricular findings were unchanged. During this interval, fetal abdominal circumference fell from around the 50th percentile to below the 3rd percentile. Umbilical and placental Doppler studies remained normal throughout.\n\nQuestion: What mechanism best explains the abdominal circumference decline despite the persistently normal Doppler findings?"},{"id":"q03-07d787f3a32afeee","specialty":"Cardiac Electrophysiology","type":"Diagnosis","month":"2026-03","claude_score":3,"gemini_score":3.0,"title":"A novel pace-mapping technique for Isthmus Identification in Non-Sustained Uncommon Atrial Flutter Pacing Technique: the INPACT method—a case report","image_count":0,"has_response":true,"search_text":"In this patient, conventional activation mapping during brief spontaneous episodes of the tachycardia showed an incomplete local activation time circuit (no clear head-meets-tail re-entry pattern), and the tachycardia could not be sustained long enough for full activation mapping. High-density voltage mapping performed instead during sinus rhythm showed a region of abnormal, fractionated low-voltage electrograms located immediately adjacent to a linear scar from a prior atrial incision, and pace-mapping later localized the highest morphology-match score (94%) to this same region. Given that post-pacing-interval measurements during brief tachycardia runs had already suggested a right atrial circuit, state the specific anatomical location of the critical arrhythmia substrate and explain why voltage mapping and pace-mapping findings were both needed to make this localization, given that activation mapping alone was insufficient.\nCase: During brief spontaneous tachycardia episodes, conventional activation mapping showed an incomplete local activation-time circuit without a clear head-meets-tail re-entry pattern. The tachycardia could not be sustained long enough for complete activation mapping.\n\nPost-pacing-interval measurements during these episodes suggested a right atrial circuit. High-density voltage mapping during sinus rhythm identified abnormal, fractionated low-voltage electrograms immediately adjacent to a linear scar from a prior atrial incision. Pace-mapping later found its highest morphology-match score (94%) in the same region.\n\nQuestion: Where is the critical arrhythmia substrate?"},{"id":"q03-31a086e5484d3cf4","specialty":"Neurodevelopment/Neurology","type":"Mechanism","month":"2026-05","claude_score":3,"gemini_score":3.0,"title":"Non-syndromic Developmental Facial Palsy Co-occurring With Chiari I Malformation: Parallel Manifestations of a Shared Prenatal Disturbance?","image_count":0,"has_response":false,"search_text":"In this patient, brain imaging obtained during a childhood seizure work-up (roughly ages 2-10) already showed subtle enlargement of the lateral ventricles and thinning of the corpus callosum. On brain imaging repeated decades later, the corpus callosum remained thin and was now also elevated, with persistent mild ventricular prominence, occurring alongside a 12-mm descent of the cerebellar tonsils below the skull base and a lifelong facial weakness present since birth. Embryologically, the facial motor nucleus arises from rhombencephalic (hindbrain) neuroepithelium, while the bony/meningeal posterior fossa forms from paraxial mesoderm-derived occipital sclerotomes; the vascular supply to the caudal pons is finalized once primitive arteries fuse into the basilar trunk during approximately gestational weeks 5-7. The corpus callosum forms later, during approximately gestational weeks 8-20, a window that overlaps with hindbrain segmentation and with differentiation of the rhombomere-derived cranial motor nuclei. Rather than treating the tonsillar descent and the callosal/ventricular findings as two unrelated diagnoses, propose a single developmental mechanism that could plausibly account for both findings together, and explain why the timing described makes this mechanism plausible.\nCase: Brain imaging obtained during a childhood seizure work-up (approximately ages 2–10) showed subtle enlargement of the lateral ventricles and thinning of the corpus callosum. Decades later, mild ventricular prominence persisted. The corpus callosum remained thin and was now elevated. The cerebellar tonsils descended 12 mm below the skull base. The patient has had facial weakness since birth.\n\nEmbryologically, the facial motor nucleus arises from rhombencephalic (hindbrain) neuroepithelium. The bony and meningeal posterior fossa develops from paraxial mesoderm-derived occipital sclerotomes. Caudal pontine vascular supply is finalized when primitive arteries fuse into the basilar trunk at approximately gestational weeks 5–7. The corpus callosum forms at approximately gestational weeks 8–20. This period overlaps with hindbrain segmentation and differentiation of the rhombomere-derived cranial motor nuclei.\n\nQuestion: What shared developmental mechanism best explains the coexisting abnormalities given their embryologic timing?"},{"id":"q03-383482ccaf626744","specialty":"Oncology/Pulmonology","type":"Treatment","month":"2026-04","claude_score":3,"gemini_score":3.0,"title":"Drug-Induced Pneumonitis Secondary to Ribociclib in a Patient With Metastatic Breast Cancer","image_count":0,"has_response":false,"search_text":"Pharmacovigilance data cited in this report ranks three CDK4/6 inhibitors by their relative risk of causing interstitial lung disease: one agent carries the highest risk, a second an intermediate risk, and a third the lowest risk among the class. The patient in this case developed pneumonitis on the intermediate-risk agent after 29 months of therapy, and after the drug was stopped and she recovered with corticosteroids, her oncology team resumed CDK4/6-inhibitor therapy for her hormone receptor-positive cancer by switching her to a different member of the same drug class rather than rechallenging with the original drug. Based on the relative pulmonary-toxicity ranking of the three agents, was the specific agent chosen for the switch pharmacologically the most risk-averse choice available, and what was the clinical outcome after the switch?\nCase: Pharmacovigilance data rank three CDK4/6 inhibitors as having the highest, intermediate, and lowest risks of interstitial lung disease.\n\nA patient developed pneumonitis after receiving the intermediate-risk agent for 29 months. The drug was stopped, and she recovered with corticosteroids. Her oncology team then treated her hormone receptor-positive cancer with another CDK4/6 inhibitor rather than restarting the original drug.\n\nQuestion: Was the selected replacement the most risk-averse CDK4/6 inhibitor available?"},{"id":"q03-3f270c29d2e82391","specialty":"Pediatric Surgery","type":"Treatment","month":"2026-06","claude_score":3.0,"gemini_score":3.0,"title":"Congenital Duodenal Stenosis Presenting with Bowel Obstruction Caused by Food Impaction in a Three-Year-Old Boy: A Case Report","image_count":0,"has_response":false,"search_text":"For this child's duodenal web, the surgical team could theoretically have attempted an endoscopic membrane-directed treatment (such as balloon dilation or membranectomy) instead of open surgery, since such endoscopic techniques have been described for congenital duodenal stenosis. State the main reason the team chose open laparotomy with duodenoplasty and membrane excision over an endoscopic membrane-directed approach in this case, and name one intraoperative finding, unrelated to the duodenal web itself, that led to an additional incidental procedure during the same operation.\nCase: A child with a duodenal web underwent open laparotomy with duodenoplasty and membrane excision. Endoscopic membrane-directed techniques, such as balloon dilation or membranectomy, have been described for congenital duodenal stenosis.\n\nQuestion: Why did the team choose open surgery instead of an endoscopic membrane-directed treatment?"},{"id":"q03-509dde6f17cb6599","specialty":"Hematology","type":"Complication","month":"2026-06","claude_score":3,"gemini_score":3.0,"title":"Delayed-Onset Severe Statin-Induced Rhabdomyolysis Due to Atorvastatin-Ticagrelor Interaction in a Patient With Acute Coronary Syndrome: A Case Report","image_count":0,"has_response":false,"search_text":"Over several days during treatment for severe rhabdomyolysis, a patient's hemoglobin fell from 12.2 g/dL to 10.2 g/dL and hematocrit fell from 36.8% to 30.2%. There was no clinical evidence of bleeding, blood and urine cultures were negative, and hemodynamics remained stable throughout. What is the most likely mechanism underlying this anemia in this clinical setting, and why is it not attributable to hemolysis or occult blood loss?\nCase: During several days of treatment for severe rhabdomyolysis, the patient's hemoglobin fell from 12.2 g/dL to 10.2 g/dL. Hematocrit fell from 36.8% to 30.2%. There was no clinical evidence of bleeding. Blood and urine cultures were negative. Hemodynamics remained stable throughout.\n\nQuestion: What mechanism best explains this anemia?"},{"id":"q03-57fd89d0a8294272","specialty":"Vascular Surgery","type":"Treatment Response","month":"2026-07","claude_score":3.0,"gemini_score":3.0,"title":"Treatment of acute hand ischemia following a scald injury in a hemodialysis patient with central venous occlusion: a case report","image_count":0,"has_response":false,"search_text":"Before the emergency procedure, bedside Doppler in the ischemic hand showed a proximal ulnar artery peak systolic velocity of 25 cm/s. Twenty-four hours after a procedure that stopped arterial inflow into the dialysis fistula (without any direct intervention on the ulnar artery itself or on the chronically occluded proximal vein), repeat ultrasonography showed the ulnar artery peak systolic velocity had risen to 47 cm/s, and the digits were clinically reperfused. Explain what this near-doubling in velocity indicates about where the flow-limiting problem actually was before treatment, and why a velocity increase — rather than a decrease — is the expected hemodynamic signature of successful treatment in this specific scenario.\nCase: Before an emergency procedure, bedside Doppler of an ischemic hand showed a proximal ulnar artery peak systolic velocity of 25 cm/s. The procedure stopped arterial inflow into the dialysis fistula. It did not directly treat the ulnar artery or the chronically occluded proximal vein. After 24 hours, the ulnar artery peak systolic velocity was 47 cm/s, and the digits were clinically reperfused.\n\nQuestion: What hemodynamic mechanism explains why successful treatment increased, rather than decreased, ulnar artery velocity?"},{"id":"q03-73158bdf7dc510b6","specialty":"Genitourinary Radiology","type":"Investigation Interpretation","month":"2026-06","claude_score":3,"gemini_score":3.0,"title":"Inflammatory renal pseudotumor mimicking renal cell carcinoma with complete radiologic resolution: A case report","image_count":0,"has_response":false,"search_text":"A renal mass was discovered during work-up of acute bacterial pyelonephritis. On imaging it was round and well-circumscribed (not wedge-shaped), and the patient had no systemic features or laboratory abnormalities such as elevated serum IgG4, hypergammaglobulinemia, eosinophilia, or hypocomplementemia. Based on these two specific findings, which two benign entities in the differential for a renal-cell-carcinoma-mimicking mass should be considered unlikely, and what specific finding argues against each?\nCase: A renal mass was found during evaluation for acute bacterial pyelonephritis. It was round and well-circumscribed rather than wedge-shaped. The patient had no systemic features or laboratory abnormalities, including elevated serum IgG4, hypergammaglobulinemia, eosinophilia, or hypocomplementemia.\n\nQuestion: Which two benign differential diagnoses are unlikely, and what finding argues against each?"},{"id":"q03-7675214922a59ac5","specialty":"Clinical Pharmacology / Neurology","type":"Treatment","month":"2026-06","claude_score":3,"gemini_score":3.0,"title":"Pharmacist-led management of suspected drug-provoked seizures and sequential antiseizure medication adverse reactions: a case report","image_count":0,"has_response":false,"search_text":"During the same admission, a different antiseizure drug caused progressive serum sodium decline (from a baseline around 140 mmol/L to a nadir of 127.2 mmol/L) and potassium decline (nadir 2.42 mmol/L) over about ten days, with associated limb weakness, falls, and exertional dyspnoea. A dose reduction alone did not reverse the trend, so the drug was stopped and replaced with a different antiseizure medication, chosen partly because the patient already had chronic kidney disease (CKD stage 3b) and partly because avoiding hepatic enzyme induction/inhibition was a priority. State which two pharmacological properties made the replacement drug specifically suitable for this patient, and identify the one biochemical abnormality that emerged shortly after starting the replacement and still required a dose adjustment despite these advantages.\nCase: During the same admission, another antiseizure drug caused progressive decreases in serum sodium and potassium over about 10 days. Sodium fell from about 140 mmol/L to 127.2 mmol/L, and potassium reached 2.42 mmol/L. The patient developed limb weakness, falls, and exertional dyspnoea.\n\nDose reduction did not reverse the decline. The drug was stopped and replaced with another antiseizure medication. The patient had stage 3b chronic kidney disease, and avoiding hepatic enzyme induction or inhibition was a priority. Shortly after the replacement was started, a biochemical abnormality required dose adjustment.\n\nQuestion: Which two pharmacological properties made the replacement antiseizure medication suitable for this patient?"},{"id":"q03-9450456df2215f02","specialty":"Respiratory Medicine","type":"Complication","month":"2026-04","claude_score":3.0,"gemini_score":3.0,"title":"Gradual Diaphragmatic Elevation and Chilaiditi Sign Associated With Phrenic Neuropathy Secondary to Cervical Disc Prolapse","image_count":0,"has_response":false,"search_text":"A man is admitted with a one-week history of worsening breathlessness and productive cough. Arterial blood gas on room air shows: pO2 70.6 mmHg, pCO2 44.4 mmHg (upper limit of normal <45 mmHg), pH 7.36, and bicarbonate 24.1 mmol/L. Spirometry performed one month earlier had shown FEV1/FVC of 75.9% (diagnostic threshold for airflow obstruction is <70%), with FEV1 and FVC both around 82-84% predicted. He also has severe, longstanding right hemidiaphragmatic weakness confirmed on ultrasound, with normal left-sided diaphragm movement, and was found on nasal swab to have a viral/bacterial co-infection causing acute bronchitis. Classify the type of respiratory failure present on this admission, and identify the two chronic (pre-existing) contributors that made him vulnerable to decompensating from what would otherwise be a mild acute infection.\nCase: A man is admitted after one week of worsening breathlessness and productive cough. On room air, arterial blood gas results are pO2 70.6 mmHg, pCO2 44.4 mmHg (normal <45 mmHg), pH 7.36, and bicarbonate 24.1 mmol/L.\n\nOne month earlier, spirometry showed an FEV1/FVC of 75.9% (airflow obstruction threshold <70%). FEV1 and FVC were both about 82–84% predicted.\n\nUltrasound confirmed severe, longstanding right hemidiaphragmatic weakness. Left diaphragmatic movement was normal. A nasal swab identified a viral/bacterial co-infection causing acute bronchitis.\n\nQuestion: What type of respiratory failure is present?"},{"id":"q03-9c2b4a89b5f2e71d","specialty":"Dermatology","type":"Prognosis","month":"2026-07","claude_score":3,"gemini_score":3.0,"title":"Folliculosebaceous cystic hamartoma of the vulva and groin: a rare case report","image_count":0,"has_response":false,"search_text":"Two of the largest nodules from a multifocal vulvar/groin papulonodular process were surgically excised, and the patient was clinically disease-free at a follow-up examination performed 4 months after surgery. Despite this favorable short-term result, continued long-term surveillance was recommended rather than considering the patient cured. Given that only the two largest nodules were removed while the process was multifocal, what is the main reason longer follow-up is warranted, and what specific outcome(s) should be monitored for?\nCase: A patient had a multifocal papulonodular process involving the vulva and groin. Only the two largest nodules were surgically excised. The patient was clinically disease-free 4 months after surgery, but long-term surveillance was recommended.\n\nQuestion: Why is longer follow-up warranted?"},{"id":"q03-ba046c3856f26530","specialty":"Gastroenterology/General Surgery","type":"Diagnosis","month":"2026-04","claude_score":3.0,"gemini_score":3.0,"title":"Intragastric Nonabsorbable Sutures From Prior Endoscopic Sleeve Gastroplasty Discovered During Robotic Hiatal Hernia Repair: A Case Report","image_count":0,"has_response":false,"search_text":"In this patient, evaluation ultimately revealed two categories of findings: (1) proximal displacement of the gastroesophageal junction with an irregular squamocolumnar (Z) line, occurring roughly a decade after a fundoplication, and (2) multiple embedded nonabsorbable suture strands spanning the antrum to fundus with an associated gastric ulcer, with pathology confirming only suture fragments and no other abnormal tissue. Should these two sets of findings be explained as a single unifying process, or as two independent, coexisting processes? Justify your answer using the operative and pathologic findings described.\nCase: About 10 years after fundoplication, evaluation showed proximal displacement of the gastroesophageal junction and an irregular Z-line. Multiple embedded nonabsorbable suture strands extended from the antrum to the fundus, with an associated gastric ulcer. Pathology showed only suture fragments and no other abnormal tissue.\n\nQuestion: Do the two sets of findings reflect one process or two independent processes?"},{"id":"q03-bbf5e4db7a3699a6","specialty":"Pediatric Thoracic Oncology / Interventional Pulmonology","type":"Mechanism","month":"2026-03","claude_score":3,"gemini_score":3.0,"title":"Tracheobronchial mucoepidermoid carcinoma in four pediatric patients","image_count":0,"has_response":true,"search_text":"A child had a large tracheobronchial tumor with near-complete airway occlusion and extension into the lower trachea; histopathology confirmed a low-grade malignant tumor harboring a fusion gene linking a CREB-regulated transcriptional coactivator to a Notch pathway coactivator. Complete resection at presentation would have required a pneumonectomy. Instead, the patient received a 7-week course of a tyrosine-kinase inhibitor that blocks a specific epithelial growth-factor receptor, intended to shrink the tumor before a less invasive operation. Explain the intended mechanism by which this drug could reduce tumor size, why this systemic approach was used despite this tumor type usually being managed with surgery alone, and describe what actually happened clinically, including why the drug course ended early and whether the strategy achieved its surgical goal.\nCase: A child had a large tracheobronchial tumor that nearly occluded the airway and extended into the lower trachea. Histopathology showed a low-grade malignant tumor with a fusion linking a CREB-regulated transcriptional coactivator to a Notch pathway coactivator.\n\nComplete resection at presentation would have required pneumonectomy. The child instead received a 7-week preoperative course of a tyrosine kinase inhibitor targeting an epithelial growth-factor receptor. The aim was to shrink the tumor enough for a less invasive operation.\n\nQuestion: What mechanism was intended to reduce the tumor size?"},{"id":"q03-e4a060c1f1614d3f","specialty":"Transplant Medicine/Occupational Medicine","type":"Complication","month":"2026-03","claude_score":3,"gemini_score":3.0,"title":"Severe Occupational Hypersensitivity Pneumonitis: A Case Series of Four Patients Requiring Lung Transplantation","image_count":0,"has_response":true,"search_text":"After bilateral lung transplantation for occupational hypersensitivity pneumonitis, a patient maintained on oral corticosteroids plus a calcineurin-inhibitor immunosuppressant (with fluctuating trough drug levels) developed new-onset hyperglycemia, with HbA1c measured at 7.8%. On subsequent follow-up testing, HbA1c had improved to 6.5% while the patient continued the same oral corticosteroid dose and remained on the calcineurin inhibitor. Identify the two drug-class mechanisms most likely responsible for this new-onset diabetes, and explain why HbA1c improved substantially even though neither causative drug class was withdrawn.\nCase: A patient underwent bilateral lung transplantation for occupational hypersensitivity pneumonitis. Maintenance immunosuppression included oral corticosteroids and a calcineurin inhibitor with fluctuating trough levels. The patient developed new-onset hyperglycemia with an HbA1c of 7.8%. At follow-up, HbA1c was 6.5% despite continuation of the same corticosteroid dose and the calcineurin inhibitor.\n\nQuestion: Which two drug-class mechanisms explain the new diabetes, and what explains the lower follow-up HbA1c?"},{"id":"q03-ec19b5219743ab26","specialty":"Thoracic Surgery","type":"Treatment","month":"2026-04","claude_score":3,"gemini_score":3.0,"title":"Large Epiphrenic Esophageal Diverticulum: An Unexpected Trap at the Distal Esophagus","image_count":0,"has_response":false,"search_text":"During urgent endoscopy, a diverticular sac about 6 cm deep was found causing 8 cm of severe luminal narrowing in the distal esophagus (from about 40 cm to 48 cm from the incisors), impassable with a standard gastroscope. A minimally invasive endoscopic option -- a myotomy performed through the septum separating the diverticulum from the true esophageal lumen, without removing the sac -- was considered for definitive treatment but was ultimately not chosen in favor of open resection of the sac plus a separate myotomy. Based on the size of this diverticulum, what specific anatomic consequence of doing a septum-directed endoscopic myotomy (without removing the sac) was the deciding concern, and what complication was it expected to risk?\nCase: During urgent endoscopy, a diverticular sac about 6 cm deep was found in the distal esophagus. It caused 8 cm of severe luminal narrowing, extending from about 40 to 48 cm from the incisors. A standard gastroscope could not pass.\n\nA septum-directed endoscopic myotomy was considered. This would divide the septum between the sac and the true esophageal lumen without removing the sac. The procedure was rejected in favor of open sac resection with a separate myotomy.\n\nQuestion: What concern led to rejection of the septum-directed endoscopic myotomy?"}]}