Abstract
Ureterosigmoidostomy has been used as a means of urinary diversion for benign and malignant disease of the urinary bladder. Recently adenocarcinoma of the colon develop-ing at the site of ureterosigmoid anastomosis has been reported with increasing incidence as a late complication of Ureterosigmoidostomy. The etiology of the malignant change in the colon remains obscure. A 60-year-old man is presented who developed polypoid lesion of the colon one year after ureterosigmoidostomy for bladder tumor. Colonofiberscopy revealed that this polyp occurred at the left ureterosigmoid anastomotic site, which was confirmed by using DIP and PSP reagent during examination. Endoscopic polypectomy with colonof iberscope was carried out. The resected polyp was 2.0×1.0cm in size, and was found to be tubular adenoma, not including carcinoma, histologically. It has been discussed that the colonic adenoma has high possibility of malignant transformation. The rate of malignant change of colonic adenoma has been reported with a range of 1.7-55.0%. Therefore, patients who undergo ureterosigmoidostomy should be followed for the rest of their lives. We recommend surveillance colonof iberscopy, including endoscopic polypectomy, and histological examination at regular intervals for these patients, beginning one year after this surgical procedure.
