Ectopic prostatic tissue in the uterine cervix.

This is the first reported case of ectopic prostatic tissue in the uterine cervix, diagnosed in a 38-year-old woman. A cluster of benign prostatic glands with cribriform and papillary patterns and focal squamous metaplasia occupied the superficial endocervical stroma. The glands were immunoreactive for prostatic specific antigen and prostatic specific acid phosphatase. This lesion, which could be confused with microglandular hyperplasia, mesonephric rests, or adenocarcinoma in situ may represent an embryonic rest.