完全钙化性脑膜瘤的CT和MRI诊断

目的：探讨完全钙化性脑膜瘤的CT与MRI特征，分析其有价值的影像信息，以提高诊断水平。材料与方法：回顾性分析经手术病理证实的完全钙化性脑膜瘤患者23例，男6例，女17例，年龄33~82岁，平均61.5岁。23例全部行CT和MRI常规检查，其中17例行MRI增强扫描。结果：23例病例CT脑窗上示病灶呈高密度影；骨窗示病灶密度不均21例，均匀2例；横断位病灶呈圆形的16例。MRI T1WI上14例病灶表现为低等信号，6例为等低信号，3例为不均质稍高信号；T2WI上12例病灶表现为以低信号为主伴有少许等或稍高信号，6例表现为以等信号为主伴有少许低或稍高信号，5例表现为稍高信号。8例病灶边缘可见薄层环状等T1等T2信号。MRI Gd-DTPA增强后12例病灶表现为明显强化，其中10例病灶表现为渐进性强化，5例强化不明显，脑膜强化的11例，5例跨大脑镰生长。结论：CT和MRI对完全钙化性脑膜瘤检查可以互补，两者结合可较客观全面地反映肿瘤的特性，提高正确诊断率。

The CT and MRI diagnosis of totally calcified meningioma

Objective： To explore the characteristics of totally calcified meningioma in CT and MRI images,analyze its valueable information,so as to improve the diagosis.Methods： Twenty-three cases（6 males and 17 females,33-82 years old with the mean age of 61.5） with calcified meningioma proven by operative pathology were retrospectively analyzed.All of them underwent CT scans,while 19 of them were examined by MRI（17 underwent enhanced scans）.Results： CT of all the 23 cases showed high density masses.Twenty-one masses were heterogeneous in density on bone-window.Sixteen masses were round in transverse-section.MRI of the tumors showed iso-intensity or slight hypo-intensity in 20 cases,and heterogeneous slightly hyper-intense in 3 patients on T1WI.On T2WI,hypo-intensity were detected mainly in 12 cases with a little iso-intensity or slight hyper-intesity;6 tumors showed iso-intensity mainly and 5 showed slight hyper-intensity.Among them,8 cases showed thin circular iso-intensity on both T1WI and T2WI.Twelve cases showed significant enhancement on T1WI,of which progressive enhancement were demonstrated in larger lesions.Dural enhancement was seen in 11 cases.Five cases were found crossing the cerebral falx.Conclusion： CT and MRI examination on completely calcified meningioma can be complementary for each other.A combination of both can reflect the characteristics of the tumor more objectively and comprehensively,and improve the diagnostic accuracy.