【摘要】 目的:探讨恶性脑膜瘤的MRI表现,提高其诊断准确率。方法:回顾分析67例经手术病理证实的恶性脑膜瘤临床、病理及MRI资料。结果:肿瘤形态多呈分叶状(26/67)、蘑菇状(7/67)及不规则状(29/67);肿瘤边缘模糊或部分边缘与周围脑组织、邻近组织分界不清:表现为单纯蛛网膜受侵犯26例、硬脑膜受侵犯18例、脑组织受侵犯8例、脑外组织受侵犯4例;肿瘤信号改变:T1WI呈等、低信号60例、等、高信号3例及较均匀信号4例,T2WI呈不均匀信号64例、较均匀信号3例,增强后均显示不均匀强化;肿瘤恶性度与瘤周水肿具有一定的关联性,瘤周水肿形态表现为:圆晕状水肿20例、指压状水肿18例、不规则水肿24例。结论:恶性脑膜瘤的MRI表现具有一定特征性,但需要注意与良性脑膜瘤鉴别。更多还原

【Abstract】 Objective:To explore the MRI features of malignant meningioma.Methods:67 cases of malignant meningiomas proved by pathology and operation were analyzed retrospectively.Results:Most of the tumors shape showed lobulated(26/67),mushroom(7/67) and irregular(29/67).The edge of tumor was blur or part of the edge was unclear around the brain tissue and close to organizational boundaries.The were 26 cases expressed as a simple arachnoids invaded,18 cases as dural invaded 8 cases as brain tissue invaded and 4 cases as outside brain tissue invaded;The changes of tumor signal were that T1WI showed equal,low signal in 60 cases,and equal,high signal in 3 cases,and more uniform signal in 4 cases,enhanced in all cases showed inhomogeneous contrast enhancement.Malignant tumor and peritumoral edema had some relevance,edema formed as follows: edema with halo-like in 20 cases,finger-like edema in 18 cases,lrregular edema in 24 cases.Conclusion:Malignant meningiomas do have characteristic MRI features of malignant meningiomas but should be differentiated from benign ones.更多还原