Primary carcinoma in situ of the ureter and renal pelvis.

Primary carcinoma in situ of the ureter or renal pelvis is rare. We describe 3 patients, each of whom had a different mode of presentation. When malignant cells in the urine from the upper urinary tract are associated with urographic evidence of an appropriate lesion, aggressive surgical therapy is indicated. In the absence of such a urographic abnormality patients with positive cytologic examinations should be followed closely because the exfoliated cells usually are from poorly differentiated neoplasms.