6[1]Fletcher CDM, Unni KK, Mertens F. WHO classification of tumours,pathology and genetics of tumours of soft tissue and bone. Lyon:IARC Press,2002
7Hart MN.Earle KM.Primitive neuroeetodermal tumours of the brain in children[J].Cancer,1973,32(4):890-897.
8Dehner LP.Peripheral and central primitive neuroectodermal tumors.A nosologic concept seeking a consensus.Arch Pathol Lab Med,1986,110:997-1005.
9Kampman WA,Kros JM,De Jong TH,et al.Primitive neuroectodermal tumours (PNETs) located in the spinal canal; the relevance of classification as central or peripheral PNET:case report of a primary spinal PNET occurrence with a critical literature review.J Neurooncol,2006,77:65-72.
10Brinkhuis M,Wijnaendts L,van der Linden JC,et al.Peripheral,primitive neuroectodermal tumourand extra-osseous Ewing' s sarcoma:a histological,immunohistochemical and DNA flow cytometric study.Virchows Archiv,1995,425:611-616.