Congenital arteriovenous malformation rupturing into a true jejunal diverticulum.

Massive hemorrhage from the gastrointestinal tract of an elderly patient due to a hitherto unreported cause is described. A congenital arteriovenous malformation located in the submucosa of a true jejunal diverticulum ruptured into the lumen. Both selective angiographic demonstration and histologic documentation of the bleeding point are presented. The simultaneous presence of these two entities is probably not a coincidence and is discussed.