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目的：通过对恶性脑膜瘤的ＣＴ、ＭＲＩ诊断加以比较研究探讨其价值及限度。材料与方法：对术后病理证实的２０例恶性脑膜瘤术前同时行ＣＴ、ＭＲＩ检查的影像学特征进行回顾性分析。结果：ＣＴ像上，病灶内密度不均匀者８例；增强后不均匀强化者４例，病灶不规则边缘呈分叶状和／或结节状者１２例，肿瘤包膜显示者２例。ＭＲＩ示肿瘤呈不均匀信号者，Ｔ１ＷＩ１３例，Ｔ２ＷＩ１４例；增强后呈不均匀强化者１４例，肿瘤不规则边缘呈分叶状和／或结节状者１４例，包膜不完整者５例，“硬膜尾征”者７例。结论：ＣＴ、ＭＲＩ在显示恶性脑膜瘤征象上是相辅相承的，不可替代的。ＭＲＩ在显示肿瘤内部纤细结构、轮廓、肿瘤包膜及“硬膜尾征”较ＣＴ优越，而对显示肿瘤占位效应、骨质增生、肿瘤边缘及肿瘤强化，ＣＴ与ＭＲＩ作用相当
OBJECTIVE: To compare the value of CT and MRI diagnosis of malignant meningioma with its value and limit. Materials and Methods: The imaging features of 20 cases with malignant meningioma confirmed by pathology before operation were retrospectively analyzed. Results: In CT images, there were 8 cases with uneven density in the lesion, 4 cases with enhanced uneven enhancement, 12 cases with lobulated and / or nodular irregular margins and 2 cases with tumor capsule display. MRI showed tumors were uneven signal, T1WI13 cases, T2WI14 cases; enhanced heterogeneity enhancement in 14 cases, irregular tumor edge lobulated and / or nodular in 14 cases, incomplete capsule in 5 cases , “Dural tail sign” in 7 cases. Conclusion: CT and MRI show the signs of malignant meningioma complement each other, irreplaceable. MRI showed superior stenosis, contour, tumor capsule and “epidural sign” compared with CT in displaying tumor internal organs, which showed the same effect as CT, MRI in displaying tumor mass effect, bone hyperplasia, tumor margin and tumor enhancement