title: Colonic angiodysplasia and blood loss.
abstract: Colonic angiodysplasia is now recognized as a frequent cause of gastrointestinal bleeding in patients over age 55. These microvascular arteriovenous malformations may be as common a cause of colonic bleeding as diverticular disease. The lesions are not evident on barium studies. Even colonoscopy and selective colonic angiography can give false-negative results. Therefore, repeated studies for recurrent episodes of bleeding are often necessary before the diagnosis is made. Methods of treatment include coagulation biopsy, segmental colon resection and right hemicolectomy.
mesh_terms: D000792:Angiography; D001165:Arteriovenous Malformations / Q000150:complications* / Q000175:diagnosis / Q000209:etiology / Q000628:therapy; D003082:Colectomy / Q000379:methods; D003106:Colon / Q000098:blood supply*; D003113:Colonoscopy; D003937:Diagnosis, Differential; D004239:Diverticulitis, Colonic / Q000175:diagnosis; D006471:Gastrointestinal Hemorrhage / Q000209:etiology* / Q000628:therapy; D006801:Humans; D008875:Middle Aged; D013671:Technetium Tc 99m Sulfur Colloid
chemical_list: D013671:Technetium Tc 99m Sulfur Colloid