Endometrial carcinoma of prostatic utricle (uterus masculinus)

With the increased number of prostatic specimens submitted for pathologic examination, the variety of lesions discovered in the processed tissue has widened. In addition to the characteristic patterns of “benign prostatic hypertrophy” and the usual ones in primary adenocarcinoma of the prostate, other lesions not intrinsically prostatic have been observed. Some proved to be extensions from cancers of nearby structures such as the periurethral glandules, urethra, urinary bladder, seminal vesicles etc. It is important to be aware of these malignancies since their natural history and response to therapy differs from the usual prostatic cancer. The case presented here shows yet another pattern which is interesting and which may be the first of its kind to be reported. The patient was a normal genotypical, phenotypical man whose prostate was removed for what was thought to be “benign hypertrophy;” however, it revealed a malignancy which was of the endometrial variety and apparently arose from the region of the utricle; in other words, a carcinoma of the uterus masculinus.