Chronic intestinal bleeding due to arteriovenous malformation of the colon.

A case of chronic intestinal bleeding due to arteriovenous malformation of the ascending colon was reported. Vascular abnormalities of the bowel represent the most common cause of gastrointestinal bleeding, the source of which could not be dislosed by conventional diagnostic procedures; selective abdominal angiography is the only most reliable technique in such cases. An acquaintance with these conditions may be of importance in the search for the cause of intestinal hemorrhages of otherwise obscure origin, and more attention should be paid to the clinicopathologic features of this entity.