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Natural or Biologic Chromoendoscopy for Detection of Colorectal Polyps EndoCollab Black or Tarry Stools UF Health Melena an overview ScienceDirect Topics Gastrointestinal Medical Terms Melena Black, tarry, foul smelling stool Indicates upper GI bleed (digested blood) Common causes: Peptic ulcer, varices Not bright red blood Hematochezia Bright red blood Melena Wikipedia
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