Cystic nephroma in adults. A report of two cases and review of the literature.

We present two cases of cystic nephroma in a 55-year old and a 61-year old women. In both patients the results of ultrasound and clinical examinations were not characteristic enough to establish the precise preoperative diagnosis. Due to the age of the patients and the location of the lesions, possibility of clear cell carcinoma with cystic changes was considered. However, microscopic examination of postoperative specimens revealed benign nature of the tumors.