[Hemangiopericytoma of the prostate: a case report].

A case of hemangiopericytoma arising in the prostate is presented. The patient, a 67-year-old male, was admitted to the hospital for difficulty in urination and underwent transurethral resection of the prostate. The pathological diagnosis was "well-differentiated adenocarcinoma and focal hemangiopericytoma". To the best of our knowledge, the only four cases of hemangiopericytoma of the prostate have been reported in the English literature so far and none in the Japanese literature.