[Primary pulmonary hemangiopericytoma].

Hemangiopericytoma seldom originates from the lung. Only 63 cases in the English literature and 30 cases in the Japanese literature have been reported. A 38-year-old female is presented in this paper. The patient was asymptomatic and was found a coin lesion of the left middle lobe by routine examination. She underwent tumorectomy and has been alive and well for 5 years. 1) The differential diagnosis of hemangiopericytoma from several other tumors is often difficult, as pericytes show no distinctive features on light microscopy. Therefore, it is emphasised that EM studies are obligatory to confirm the diagnosis of this tumor. 2) The origin of vessels with a characteristic staghorn appearance on light microscopy have not been described in previous papers. Bronchial arteriography in this case revealed that tumor vessels arose mainly from the bronchial artery.