Primary Prostatic Wilmsʼ Tumor

The first case of primary Wilms' tumor of the prostatic gland is described. It occurred in a 32-year-old man. Histologically, it consisted of a triphasic tumor; tubular and glomeruloid structures were identified, among prominent blastematous sheets and in an edematous stroma. No teratomatous components were encountered. We propose that this prostatic primary, nonteratomatous Wilms' tumor can arise from persistent, nephrogenic, blastematous rests in the prostate, in relation to the Wolffian duct system.