特殊部位的脑膜瘤CT、MRI影像表现

目的　探讨特殊部位脑膜瘤的影像特征。方法　回顾性分析 11例手术和病理证实的特殊部位 (侧脑室、鞍隔、额窦 )脑膜瘤的MRI、CT表现。其中MRI检查 8例 ,CT检查 3例。结果　 11例均为单发。位于侧脑室 4例 ,鞍隔 4例 ,额窦 3例。T1WI加权像上脑膜瘤信号主要为等信号和略低信号。T2 WI加权像上脑膜瘤信号主要为等信号、略高信号、略低信号。MR增强为均匀强化或不均匀强化。CT平扫 :表现为均匀等密度和稍高密度 ,均未做强化。病理分型 :纤维母细胞型 4例 ,血管母细胞型 3例 ,合体细胞型 1例 ,砂粒体型 3例。 11例脑膜瘤中有 9例误诊。结论　提高特殊部位脑膜瘤影像学诊断正确率 ,对临床确定正确手术入路、提高肿瘤手术治愈率有重要意义

CT and MRI Findings of Meningiomas at Special Locations

Objective To study the CT and MRI features of meningiomas at special locations.Methods CT and MRI findings of meningiomas at special locations (lateral ventricle,diaphragma sellae,frontal sinus) in 11 cases confirmed by pathology were analyzed retrospectively.8 patients were evaluated with MRI,3 patients were evaluated with CT.Results 11 cases were all singular lesion.The lesions were at lateral ventricle in 4, at diaphragma sellae in 4,at frontal sinus in 3.Of total 11 cases,8 cases showed isointensity or slight hypointensity signal on T 1WI ,tumors had isointensity or slight hyperintensity signal or slight hypointensity signal on T 2WI,homogeneous or inhomogeneous enhancement were found on Gd-DTPA enhanced MRI scanning.3 cases were showed homogeneous density or slight highly density on plain CT scanning.Pathological diagnosis was as follows:fibroblastic type in 4,angioblastic type in 3,syncytial type in 1,psammomatous type in 3.There were 9 cases were misdiagnosed before operation.Conclusion It is a fact that improving the imaging correct diagnostic rate of meningioma at special locations will play an important role in deciding correct operative route of entry and increasing cure rate.