Guidelines for monitoring of patients with ureterosigmoidostomy

Experimental evidence is difficult to interpret as some laboratory animals develop neoplasms very readily in urinary reservoirs and yet other animals develop few, thus the results cannot be translated from one species to another with confidence. EXECUTIVE SUMMARY Neoplasia at the anastomosis of the ureters and colon in patients with any urinary diversion that mixes urine and stool (in effect, ureterosigmoidostomy and its variations) occurs in about 24% of patients at 20 years of follow up.