title: Letter: Colonic bleeding.
mesh_terms: D000367:Age Factors; D000368:Aged; D000792:Angiography; D001466:Barium Sulfate / Q000009:adverse effects; D003106:Colon / Q000098:blood supply; D003108:Colonic Diseases / Q000175:diagnosis*; D004733:Enema / Q000009:adverse effects; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis*; D006801:Humans; D008638:Mesenteric Arteries / Q000000981:diagnostic imaging; D008642:Mesenteric Veins / Q000000981:diagnostic imaging
chemical_list: D001466:Barium Sulfate