Sigmoid adenocarcinoma complicating ureterosigmoidostomy

A 31-year-old man who died of metastatic adenocarcinoma of the sigmoid colo n had undergone bilateral ureterosigmoidostomy for exstrophy of the bladder 20 years earlier. The patient never underwent a colonoscopy. Neoplastic tr ansformation at the ureterosigmoid anastomosis must be considered as a poss ible severe complication, and therefore, periodic follow-up these patients is mandatory.