单纯疱疹病毒性脑炎是最常见的散发性脑炎,在ＣＴ或ＭＲＩ上常表现为单或多发,单侧或双侧颞或额叶弥漫性斑片低密度或长Ｔ1、长Ｔ2信号,占位效应轻,表现为大片或团块样,并有明显占位效应者非常少见,常被误诊为脑肿瘤。本文回顾分析11例,以便提高其认识和诊断水平。1　资料与方? Herpes simplex virus encephalitis is the most common sporadic encephalitis, CT or MRI often showed as single or multiple, unilateral or bilateral temporal or frontal diffuse plaque low density or long T1, long T2 signal, Placeholder effect is light, the performance of large or mass-like, and obvious occupying effect is very rare, often misdiagnosed as brain tumors. This article retrospective analysis of 11 cases, in order to improve their awareness and diagnostic level. 1 information and party?