Colonic adrenocarcinomas in patients with ureterosigmoidostomies.

Two additional cases of adenocarcinoma of the sigmoid colon occurring at the site of ureterosigmoidostomy are reported. The high risk of this complication occurring in patients who have undergone ureterosigmoidostomy is described. The possible shortness of the interval from diversion to development of an adenocarcinoma, especially in those cases involving carcinoma of the bladder, is emphasized. It is strongly recommended that careful follow up of such patients should begin within several years of establishment of the ureterosigmoidostomy.