title: Colonoscopy in acute rectal bleeding.
mesh_terms: D000368:Aged; D000792:Angiography; D003113:Colonoscopy / Q000009:adverse effects*; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis* / Q000209:etiology; D006801:Humans; D012002:Rectal Diseases / Q000175:diagnosis; D012007:Rectum; D013667:Technetium
chemical_list: D013667:Technetium