Lower gastrointestinal hemorrhage from an arterioenteric fistula in a pancreatorenal transplant patient.

We report a case of a severe lower gastrointestinal hemorrhage caused by arterioenteric fistula formation in a pancreas transplant patient. A rare but potentially deadly complication of pancreas transplant surgery, arterioenteric fistulas should be considered in every transplant patient presenting with voluminous gastrointestinal bleeding. If diagnosed promptly, angiographic and surgical intervention can prevent serious morbidity and mortality.