Renal cell carcinoma in a patient successfully treated for Wilms's tumor

A woman who had received successful therapy for Wilm's tumor of one kidney in childhood developed renal cell carcinoma in the opposite kidney 21 years later. Such an occurrence has not been reported previously. A discussion of the differential diagnosis of calcified renal mass lesions and the angiographic differentiation between Wilms's tumor and renal cell carcinoma is presented. The possible relationship between these two primary renal tumors is considered.