Rectal duplication as a cause of neonatal bladder outlet obstruction and hydronephrosis.

Duplication of the rectum is a rare embryogenic event with only 70 cases reported in the literature. These lesions manifest as bowel obstruction, hemorrhage, fistula formation, pain or palpable mass. We report a case of bladder outlet obstruction with severe bilateral hydronephrosis caused by rectal duplication.