title: Extraventricular neurocytoma in pediatric populations: A case report and review of the literature.
abstract: Extraventricular neurocytomas (EVNs) are rare neuronal tumors included in the definition of neoplasms in the 2007 World Health Organization classification of tumors of the central nervous system. Although a small case series of EVNs in adults has been previously reported, EVNs in pediatric populations are extremely rare. The current case report presents the clinicopathological features of an EVN in a 2-year-old female who presented with nausea and vomiting that had lasted for five days. In addition, an analysis of the imaging features, histology, treatment and prognosis of these reported rare lesions is presented. Immunohistochemically, EVNs are characterized by the robust expression of synaptophysin, but with a lack of oligodendrocyte transcription factor 2, isocitrate dehydrogenase enzyme isoform 1 (IDH1) R132/IDH2 R172 mutations and p53 immunoexpression. The treatment for EVNs in pediatric and adult populations is gross total resection, with post-operative radiation reserved for subtotal resection or recurrent disease. In addition, drop metastasis must be carefully avoided.
authors.affiliation: Department of Neurosurgery, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China.
authors.forename: Lin
authors.initials: L
authors.lastname: Han
authors.forename: Hongquan
authors.initials: H
authors.lastname: Niu
authors.forename: Junwen
authors.initials: J
authors.lastname: Wang
authors.forename: Feng
authors.initials: F
authors.lastname: Wan
authors.forename: Kai
authors.initials: K
authors.lastname: Shu
authors.forename: Changshu
authors.initials: C
authors.lastname: Ke
authors.forename: Ting
authors.initials: T
authors.lastname: Lei
keywords: extraventricular neurocytoma; pediatrics