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melena is overwhelmingly associated with UGIB rather than with lower GI bleeding (LGIB), which is distal to the duodenojejunal junction at the ligament of Treitz. Melena of less than 24 hour Melena: What Is It, Causes, Symptoms, Bleeding, Treatment, and More Osmosis Endoscopy showing mucosal changes in the duodenum that resembled Download Scientific Diagram Acute upper gastrointestinal bleeding in a patient with malignant melanoma BMJ Case Reports
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