Massive GI hemorrhage from an ileal duplication cyst in an adult.

We describe an unusual case of a 32-yr-old man who presented with massive GI hemorrhage as an initial manifestation of an ileal duplication cyst. The lesion was first revealed by visceral angiography during investigation of the bleeding source. At laparotomy, a large ileal duplication containing full-thickness gastric-type mucosa was identified. Ulceration of the ileal mucosa adjacent to the communicating orifice was found to be the source of bleeding. Duplications of the alimentary tract are rare congenital malformations. Patients usually present in infancy and childhood, although delayed complications can present in adulthood. This entity should be considered among other lesions that can cause massive GI hemorrhage not diagnosable by endoscopy.