Rapid local recurrence of an extraventricular neurocytoma that had disappeared after gamma knife radiosurgery

Central neurocytoma (CN),first described by Hassoun et al in 1982,is a rare neuronal tumor of the central nervous system,and accounts for 0.25％-0.5％ of all intracranial tumors.CN commonly occurs as an intraventricular mass but may also occur as a periventricular parenchymal mass or even in locations remote from the ventricles,in which case it is termed as an extraventricular neurocytoma (EVN) (cerebral).EVNs show a wide variability with regard to morphologic features,cellularity,and proliferation rate and are more frequently associated with poorer clinical outcomes than CNs.1 To our knowledge,little is known regarding the treatment of atypical neurocytomas.