Wilms' Tumor Presenting a Cystic Pattern in Ultrasonography

Abstract

We have experienced a case of Wilms' tumor in whom a cystic pattern was domonstrated by ultrasonography. It was an unusual finding in our series of 15 patients with Wilms' tumor. In such situation, it is rather difficult to differentiate Wilms' tumor from other benign tumors during pre- and intra-operative periods. Differential diagnosis between Wilms' tumor and benign tumors, such as multiocular cyst of the kidney and partially differentiated cystic nephroblastoma, was discussed with a review of literature. It was concluded that intraoperative pathological diagnosis of such cystic diseases of the kidney is very important because operative procedure and its prognosis are entirely different if the tumor is malignant.