目的探讨脑室外神经细胞瘤(extraventricular neurocytoma,EVN)MRI特征,提高对该肿瘤的认识。资料与方法回顾性分析6例EVN的MRI表现,并结合文献研究其MRI特征。结果6例均经手术及病理证实。肿瘤位于额叶3例,其余3例分别位于顶叶、颞叶及鞍区;肿瘤呈类圆形者边界清楚,形态不规则者境界不清;肿瘤实性或囊实性,实性多见,T1WI呈等或稍低信号,T2WI呈稍高信号,其间夹杂等、低或高信号,可提示钙化、流空血管、出血或囊变坏死,液态衰减反转恢复序列(FLAIR)呈高信号为主的混杂信号;囊实性者,实性部分信号同实性肿瘤,囊性部分呈长T1、长T2信号,信号较均匀;瘤周水肿无或轻;增强后呈轻-中度不均匀强化;占位效应轻。结论EVN的MRI表现具有一定特征性,MRI平扫及增强扫描有助于其诊断。 Objective To investigate the MRI features of extraventricular neurocytoma (EVN) and to improve its understanding of the tumor. Materials and Methods Retrospective analysis of MRI findings of 6 cases of EVN, combined with the literature to study its MRI features. Results 6 cases were confirmed by surgery and pathology. The tumor was located in the frontal lobe in 3 cases, and the remaining 3 cases were located in the parietal lobe, temporal lobe and saddle area respectively. The tumor was round, with clear boundary and irregular shape. The tumor was solid or cystic, , T1WI was equal or slightly lower signal, T2WI was slightly higher signal, during which mixed, low or high signal, can be prompted calcification, empty vessel, hemorrhage or cystic degeneration, fluid attenuation inversion recovery sequence (FLAIR) was high signal Mainly mixed signal; cystic solidity, the solid part of the signal with solid tumors, cystic part of the long T1, long T2 signal, the signal is more uniform; peritumoral edema without or light; increased was mild to moderate Uniform strengthening; placeholder effect light. Conclusion The MRI findings of EVN have certain characteristics. MRI plain scan and enhanced scan are helpful to its diagnosis.