Prostate diverticulum.

Pure cysts of the male genital system are rare, with the exception of epididymal cysts. Midline cystic masses in or near the prostate represent either an infectious etiology or utricular/Mullerian duct cysts. Prostatic diverticuli are extremely rare entities. A 61-year-old man presented with symptoms consistent with an active pelvic infection and computed tomography evidence of what was thought to be an intraprostatic abscess. Further studies revealed a large prostatic diverticulum and a poorly compliant bladder. The patient eventually required urinary diversion for symptom relief and upper urinary tract conservation.