title: Unexplained rectal bleeding.
mesh_terms: D000328:Adult; D000368:Aged; D000792:Angiography; D001466:Barium Sulfate; D003108:Colonic Diseases / Q000175:diagnosis; D004724:Endoscopy; D004733:Enema; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis*; D006801:Humans; D008875:Middle Aged; D012002:Rectal Diseases / Q000175:diagnosis; D012007:Rectum; D012812:Sigmoidoscopy
chemical_list: D001466:Barium Sulfate