[Prostate cancer associated with hemorrhagic cyst: a case report].

A 68-year-old man consulted our department for sudden onset of dysuria and perineal pain. On digital rectal examination, soft and a hen-egg-sized mass was palpated. Serum PSA value was elevated to 11.4 ng/ml. Pelvic magnetic resonance imaging (MRI) suggested a large hemorrhagic cyst associated with prostate cancer. In addition to a pathological diagnosis as poorly differentiated adenocarcinoma (Gleason grade 5/4), which was established by transurethral biopsy, aspirated cyst contents revealed an elevated PSA value (3,090 ng/ml). Clinical staging was determined as T4N0M0. Following administration of androgen-deprivation therapy for 3 months, radiation therapy (64 Gy) was administered to the prostate. Twelve months after the diagnosis, the serum PSA value has remained within normal limits, and no local recurrence of the disease was detected.