[Malignant peritoneal mesothelioma of the prostate: a case report].

A case of malignant peritoneal mesothelioma of prostate in a 52-year-old male is reported. He was admitted to the hospital with the complaint of perineal pain. The prostate was enlarged markedly, elastic soft and severely tender. CT scan and some examinations suggested the possibility of prostatic malignancy. The histological findings of the needle biopsy specimen revealed peritoneal mesothelioma. Complete pelvic exenteration was performed, because of direct invasions to the urinary bladder and the rectal anterior wall. The final pathological diagnosis revealed malignant fibrous peritoneal mesothelioma with solitary type of the rectovesical recess. At three months after the operation, the patient died of local resurrence and multiple metastasis to liver and lung. Only three cases of peritoneal mesothelioma, with solitary type, of rectovesical recess or retrovesical space have so far been reported in Japan.