[Colonic polyps at the level of the site of an ureterosigmoidostomy 11 years after conversion of a Coffey operation to a continent ileocecal bladder. A case].

The case of precancerous polyp arising at the two sites of ureterosigmoidostomy 11 years after conversion to continent ileocaecal conduit is reported. The authors discuss risk factors, presenting conditions, therapeutic implications and preventive measures.