Colonic neoplasms complicating ureterosigmoidostomy.

A benign reactive polyp developed at each ureteral implantation in the sigmoid colon following bilateral ureterosigmoidostomy for exstrophy of the bladder. The first polyp was discovered 23 years after the operation. The second polyp occurred 4 years later at the other ureteral orifice. Each polyp contained benign cystic glandular epithelium within the submucosa and the stalk. These submucosal cysts resembled colitis cystica profunda, except that they were confined to the pedunculated polyps. A complete review of the literature of neoplasms complicating ureterosigmoidostomy is presented. It is concluded that a benign or a malignant colonic tumor may develop at the site of the ureterocolic anastomosis many years later. Therefore, patients who undergo this operation should be followed for the rest of their lives.