Villous adenoma in the large bowel following ureterosigmoidostomy: a case report and review of the pertinent literature.

This report presents a case of colonic adenoma which developed after ureterosigmoidostomy. A 71-year-old man was initially treated by total cystectomy and ureterosigmoidostomy for transitional cell carcinoma of the bladder in 1970. In 1983, a routine checkup revealed urinary occult blood. A barium enema x-ray showed a polypoid lesion in the sigmoid colon. Colonoscopy confirmed the presence of the polyp adjacent to the ureteral stoma. The biopsy findings were interpreted as villous adenoma with severe atypia. This tumor was removed endoscopically. This is the seventh case report of neoplasia occurring in the sigmoid colon after ureterosigmoidostomy in Japan. Review of the pertinent literature indicates that patients who have undergone this type of urinary diversion have an increased risk of development of large bowel neoplasia. Adequate and regular surveillance of these patients has been suggested in order to help in early detection.