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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 is defined as: A) Bright red blood per rectum B) Black, tarry stool due to digested blood C) Yellow fatty stool D) Green mucus stool Primary and metastatic melanoma of the GI tract: clinical presentation, endoscopic findings, and patient outcomes Surgical Endoscopy Springer Nature Link Melena MEDizzy Lentigo maligna and lentigo maligna melanoma A Rare Case of Skin and Small Intestine Pigmentation Gastroenterology
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