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Three patients present with overt gastrointestinal bleeding after nondiagnostic upper endoscopy and colonoscopy. With only one technetium-99m pertechnetate scan possible, which patient characteristics and clinical clues guide your choice for this specialized study? What factors should inform alternative diagnostic decisions when standard modalities have failed, and how do embryologic origins influence your next steps? Important note: This material is entirely AI-generated and has not been verified by human experts; despite stringent consensus checks, perfect accuracy cannot be guaranteed. Exercise caution — always corroborate the content with trusted references and licensed, qualified professionals, and never apply information from this content to patient care or clinical decisions without independent verification by a licensed and qualified professional in the field. Not medical advice. For educational purposes only. This video is provided for either licensed, qualified professional teachers who will review and approve the materials for their students, or for licensed professionals who will review the content and confirm its accuracy with their professional judgment and other medical references before using these materials to study. It is a teaching and study aid. VIDEO INFO Category: Digestive Tract Anatomy, Human Anatomy, USMLE Step 1 Difficulty: Hard - Advanced level - Challenges experienced practitioners Question Type: Diagnostic Failure Case Type: Multi Patient Explore more ways to learn on this and other topics by going to https://endlessmedical.academy/auth?hash=1dce62dde7bacd00 QUESTION You are the on-call gastroenterology consultant at a regional hospital. Three patients with overt gastrointestinal bleeding have already had nondiagnostic upper endoscopy and colonoscopy within the last 24 hours at referring facilities. Nuclear medicine has one technologist available at 07:00 for exactly one specialized study before the team moves to an emergency trauma case.... OPTIONS A. Select Patient B for technetium-99m pertechnetate scintigraphy (Meckel scan) obtained during a hemodynamically quiet interval-optionally after short H2-blocker pretreatment if not contraindicated-because an adolescent with recurrent painless lower GI bleeding after negative EGD/colonoscopy likely... B. Select Patient B for immediate tagged RBC scintigraphy instead of a Meckel scan because pediatric lower GI bleeding is best localized with RBC imaging; for Patient A repeat CTA during a quiet interval, and for Patient C observe without angiography unless bleeding recurs. C. Select Patient A for a Meckel scan because adult obscure GI bleeding with iron deficiency and right-lower-quadrant pain is most often due to a Meckel diverticulum; for Patient B schedule CT enterography later, and for Patient C repeat colonoscopy despite prior negative findings. D. Avoid Meckel scintigraphy for all three and repeat colonoscopy for each, because a single nondiagnostic exam does not justify nuclear medicine imaging when bleeding persists. CORRECT ANSWER A. Select Patient B for technetium-99m pertechnetate scintigraphy (Meckel scan) obtained during a hemodynamically quiet interval-optionally after short H2-blocker pretreatment if not contraindicated-because an adolescent with recurrent painless lower GI bleeding after negative EGD/colonoscopy likely has a bleeding Meckel diverticulum with ectopic gastric mucosa; for Patient C proceed to urgent catheter angiography with possible embolization given cecal extravasation on CTA, and for Patient A pursue deep enteroscopy or CT enterography depending on stability. EXPLANATION When both EGD and colonoscopy are nondiagnostic in overt lower GI bleeding, selection of nuclear or angiographic testing hinges on the suspected source and the physiologic basis of the modality. Technetium-99m pertechnetate scintigraphy (Meckel scan) detects ectopic gastric mucosa rather than active bleeding; it is most useful in children and adolescents with recurrent painless hematochezia after negative endoscopy because Meckel diverticulum with gastric heterotopia is the classic cause. Patient B fits this pattern, so a Meckel scan during hemodynamic stability-optionally after an H2 blocker to improve mucosal retention-is the best use of the one available nuclear slot.... --------------------------------------------------- Our cases and questions come from the https://EndlessMedical.Academy quiz engine - multi-model platform. Each question and explanation is forged by consensus between multiple top AI models (i.e. Open AI GPT, Claude, Grok, etc.), with automated web searches for the latest research and verified references. Calculations (e.g. eGFR, dosages) are checked via code execution to eliminate errors, and all references are reviewed by several AIs to minimize hallucinations. Clinicians already rely on AI and online tools - myself included - so treat this content as an additional focused aid, not a replacement for ...

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