[Prostatic cancer with cystic degeneration: a case report]

A 73-year-old man with prostatic cancer with cystic degeneration is reported. He visited our clinic for postoperative examination of left metastatic lung cancer and treatment of prostatic hypertrophy. When the prostatic biopsy was performed, bloody fluid was aspirated and prostate size on digital examination was reduced. The obtained specimen consisted of scar tissue. Urethrography showed an elongation of prostatic urethra in addition to the compression of urinary bladder from the rear. CT scan demonstrated a prostatic cyst approximately 8 cm in diameter with an irregular margin. Following the transurethral resection of the prostate, the prostatic cyst was opened and papillary tumor observed. Histological examination revealed a well differentiated medullary cancer which coincided with the pathological finding of left metastatic lung cancer. He died from dyspnea caused by pleuritis carcinomatosa 6 years later. Nine cases of prostatic cancer with cystic degeneration in the Japanese literature are reviewed.