title: Solitary rectal ulcer as a cause of massive lower gastrointestinal bleeding.
mesh_terms: D006471:Gastrointestinal Hemorrhage / Q000209:etiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D012002:Rectal Diseases / Q000150:complications*; D014456:Ulcer / Q000150:complications*