1)Coffey RJ, Cascino TL, Shaw EG:Radiosurgical treatment of recurrent hemangiopericytomas of the meninges:preliminary result. J Neurosurg 78:903-908, 1993
2)Guthrie BL, Ebersold MJ, Scheithauer BW, Shaw EG:Meningeal hemangiopericytoma:Histopathological features, treatment, and long-term follow-up of 44 cases. Neurosurgery 25:514-522, 1989
3)Jaaskelainen J, Servo A, Haltia M, Wahlstrom T, Valtonen S:Intracranial hemangiopericytoma:Radiology, surgery, radiotherapy, and outcome in 21 patients. Surg Neurol 23:227-236, 1985
4)Marc JA, Takei Y, Schechter MM, Hoffman JC:Intracranial hemangiopericytomas. Angiography,pathology and defferential diagnosis. Am J Roentgenol Radium Ther Nucl Med 125:823-832, 1975
5)Mena H, Ribas JL, Pezeshkpour GH, Cowan DN, Parisi JE:Hemangiopericytoma of the central nervous system:A review of 94 cases. Hum Pathol 22:84-91, 1991
6)Moss TH:Immunohistochemical characteriatics of haemangiopericytic meningiomas:Comparison with typical meningiomas, haemangioblastomas and haemangiopericytomas from extraranial sites. Neuropatholo Appl Neurobiol 13:467-480, 1987
7)Nagashima H, Kobayashi S, Takemae T, Tanaka Y:Total resection of torcular herophili hemangiopericytoma with radial artery graft:Case report. Neurosurgery 36:1024-1027, 1995
8)Wakai S, Yamakawa K, Manaka S, Takakura K:Spontaneous intracranial hemorrhage caused by brain tumor:Its incidence and clinical significance. Neurosur-gery 10:437-444, 1982