2Kleihues P,Cavenee WK.World Health Organization classfication of tumours.Pathology and genetics of tumours of the nervous system.Lyon:IARC Press.2000.
3Hsu DW,Efird JT,Hedley-Whyte ET.Progesterone and estrogen receptors in meningiomas:Prognostic considerations,J Neurosurg.197,86(1):113-120.
