Asymptomatic kidney tumors incidentally diagnosed in two patients.

In the years 1962--1975, at the Urological Department of the District Hospital in Warsaw, 1607 patients were operated on because of nephrolithiasis. In two cases coexistence of nephrolithiasis with renal tumour was demonstrated during operation. Physical and preoperative X-ray examinations suggested neither tumour nor metastatic foci in these two patients. The coexistence of nephrolithiasis and tumour of the kidney is a rarity (in our material 0.12%). Lumbotomy carried out because of nephrolithiasis makes possible a precise evaluation of the kidney condition and early discovery of tumour producing no clinical symptoms or X-ray changes.