Lower gastrointestinal bleeding from the internal iliac artery: angiographic demonstration of an iliac arteriocolic fistula.

A rare source of potentially massive lower gastrointestinal hemorrhage in women is advanced gynecologic malignancy. Such patients can develop gastrointestinal hemorrhage with or without prior pelvic irradiation, due to arteriocolic fistulas. Angiography permits the correct diagnosis and subsequent embolotherapy.