Endometrioid carcinoma of prostate.

A prostatic tumor that was excised from a sixty-two-year-old man was found histologically to resemble papillary endometrial carcinoma. A specimen of this prostatic endometrioid carcinoma tested positive for prostate-specific antigen and focally positive for mucin, confirming the prostatic epithelial origin of the tumor. A review of the literature indicates that tumors of this type are best approached as a standard acinar adenocarcinoma of the prostate.