An Unusual Cause of Melena: Adjacent Sigmoid Tubular Adenomas With Moderate Dysplasia-A Case Report.

Melena usually indicates upper gastrointestinal bleeding but may rarely result from slow bleeding in the distal colon. When upper endoscopy is negative, colonoscopy is essential. Although uncommon, bleeding colonic adenomas should be considered, as endoscopic polypectomy can provide both diagnosis and definitive treatment.