Abstract
Prostate duct adenocarcinoma, previously referred to as endometrioid carcinoma because of its histological resemblance to endometrial carcinoma, is a rare prostatic malignancy. Histologically, this tumor is characterized by marked cellular atypia and pleomorphism. The main differential diagnosis includes high-grade prostatic intraepithelial neoplasia and urothelial carcinoma. We present a case of 78 yr old male with a prostate duct adenocarcinoma simulating urothelial carcinoma. Immunohistochemical studies were crucial to establish the diagnosis. (The J Histotechnol 24:121, 2001)Submitted: February 19, 2001; Accepted with revisions: February 20, 2001
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