Abstract
A 54-year-old man presented with a 5-month history of left back pain and no urological problems. Physical examination was unremarkable. The results of laboratory tests were within normal limits, urinalysis was normal and urine cytology was negative. The left kidney was not visualized on excretory urography. Computerized tomography (CT) revealed a heterogeneous 3 em. mass in the upper part of the left ureter and left hydronephrosis with thin parenchyma Diagnosis was ureteral cancer and consequently total left nephroureterectomy was performed. There were no postoperative complications and the patient was discharged from the hospital 23 days after surgery. Followup with excretory urography and CT revealed no recurrence for 7 months. The 4 x 3 x 3 cm. resected mass was rubbery firm with a yellowish-white cut surface and it surrounded the upper part of the left ureter. Macroscopic inspection of the cut surface revealed no obvious lesion on the ureteral mucosa. On microscopy the mass was not encapsulated and it was located
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