Primary carcinoma in situ of the ureter: a case report.

A case of primary carcinoma in situ of the right ureter without a history of bladder tumors is presented. Cytological investigation of the right ureteral urine specimens revealed malignant cells and computerized tomography showed focal thickening of the upper portion of the right ureter. The patient underwent right nephroureterectomy, including excision of a bladder cuff. The diagnostic role of exfoliative urinary cytology is emphasized.