RT Journal Article SR Electronic T1 MR Imaging of Cerebral Extraventricular Neurocytoma: A Report of 9 Cases JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology DO 10.3174/ajnr.A3264 A1 K. Liu A1 G. Wen A1 X.-F. Lv A1 Yan-Jia Deng A1 Yong-Jian Deng A1 G.-Q. Hou A1 X.-L. Zhang A1 L.-J. Han A1 J.-L. Ding YR 2012 UL http://www.ajnr.org/content/early/2012/09/27/ajnr.A3264.abstract AB SUMMARY: Extraventricular neurocytoma is a rare entity, most frequently occurring in brain parenchyma outside the ventricular system. The purpose of this study was to characterize the MR imaging findings in a series of 9 patients with EVN verified by results of pathologic examination. All 9 EVNs were solitary and intracranially located. Eight lesions were well demarcated, and 3 showed intratumoral hemorrhage. The solid parts of 7 tumors were primarily isointense on T1-weighted images and heterogeneously enhanced on T1WI with contrast. Although cerebral EVNs can present a wide spectrum of appearances on MR, the imaging patterns appear to vary according to anatomic location and cellularity. Lesions in frontal or parietal lobes often present as well-demarcated large masses with cystic degeneration, hemorrhage, mild-to-moderate edema, and inhomogeneous enhancement. Moreover, the general isointensity of the solid parts of EVN on T1WI may be of some specificity. Abbreviations CNcentral neurocytomaEVNextraventricular neurocytomaWHOWorld Health Organization