Mucin changes adjacent to carcinoma following ureterosigmoidostomy

A patient with epispadias had a ureterosigmoidostomy. This was converted to an ileal conduit 3.5 years later. 24 years after this, he developed an adenocarcinoma at the site of the ureteric stump. Abnormal mucin staining was found in the resected colon. This stain is not predictive of malignant change, and therefore regular colonoscopy is required for these patients.