微囊型脑膜瘤的MRI分型研究

MRI typing study of microcystic meningiomas

目的探讨微囊型脑膜瘤的MRI分型,提高对本病的认识。材料与方法回顾性分析20例经手术病理证实的微囊型脑膜瘤的影像学资料,20例均行MRI平扫,MRI增强扫描16例。结果20例中1型9例(40.9%),2型5例(22.7%),3例6例(27.2%);9例1型均为实性肿块,T1WI呈低信号,T2WI呈高信号,MRI增强扫描肿瘤显著均匀强化;5例2型均似囊性肿块,T1WI呈显著低信号,T2WI呈显著高信号,MRI增强扫描肿瘤呈网格、片絮、辐射状轻度强化,其中2例肿瘤边缘可见囊状无强化区;6例3型均为囊实性肿块,实性部分T1WI呈稍低信号,T2WI呈稍高信号,囊性部分T1WI呈低信号,T2WI呈高信号,增强扫描肿瘤实性部分显著强化,囊性部分无强化,囊壁轻度强化。结论微囊型脑膜瘤MRI分型均有其各自特点,其中以2型MRI表现最具特征。

Objective:To explore the MRI typing of microcystic meningiomas and improve the understanding of this disease.Materials and Methods:Twenty cases microcystic meningiomas confirmed by surgery and pathology was retrospectived analysis,20 cases were performed by MRI plain scan and MRI enhanced scan in 16 cases.Results:Of the 20 cases,9 cases(40.9%)were type 1 and 5 cases(22.7%)were type 2,and 6 cases(27.2%)were type 3.Nine cases type 1 were solid mass,low signal on T1 weighted image,and high signal on T2 weighted image.MRI enhanced scanning showed significant uniform enhancement of tumors.Five cases type 2 showed that similar cystic masses,significant low signal on T1 weighted image,significant high signal on T2 weighted image,MRI enhanced scanning tumor showed grid,flake,and radiation mild enhancement,of which 2 cases cystic non-enhanced areas at the edge of the tumor.Six cases type 3 were cystic solid masses,the solid area showed that a slightly lower signal on T1 weighted image,and slightly higher signal on T2 weighted image,the cystic area showed a low signal on T1 weighted image,high signal on T2 weighted image,enhanced scan the solid part of the tumors was significantly enhanced,the cystic part was not strengthened,and the cyst wall was slightly strengthened.Conclusions:MRI typing of microcystic meningioma has its respective characteristics,of which type 2 MRI finding was the most characteristic.