Acute regional enteritis.
Severe melena is a rare complication of acute regional enteritis. The hemorrhage is more severe when the large intestine is also involved. The difference betwee "real" acute regional enteritis and exacerbations of regional enteritis lies in their pathological appearance, development and complications.
D000208:Acute Disease; D000328:Adult; D003424:Crohn Disease / Q000150:complications / Q000473:pathology / Q000601:surgery; D006801:Humans; D008297:Male; D008551:Melena / Q000209:etiology