Ectopic prostatic tissue in the bladder.

Ectopic prostatic tissue in the bladder has rarely been reported and usually involves the midline in the form of vestigial remains of embryonic prostatic elements. To our knowledge there are only 32 reports on this lesion in the literature in English. Prostatic heterotopia may be endoscopically confused with malignancy in the urinary system. We report three cases of ectopic prostatic tissue at the retrotrigonal area and left ureteral orifice. The patients presented with gross or microscopic hematuria and all the lesions had a polypoid appearance. The histopathologic and immunohistochemical examination revealed the prostatic nature of the tissue. No recurrences were evidenced. The authors review the literature concerning this lesion which should be recognized by urologists and pathologists, who must be aware of its benign nature.