恶性脑膜瘤CT与MRI诊断的比较研究

The Compared Study of CT and MRI Diagnosis of Malignant Meningiomas

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。

Objective: To compare study of CT and MRI diagnosis of malignant meningioma.Materials and Methods: Twenty patients with malignant meningioma, confirmed by pathological findings, were analyzed on CT and MRI retrospectively.Results: On CT inhomogenous density/intensity with the lesions (n=8), inhomogenous enhancement (n=4). Irregular outline with lobulation or/and nodule (n=12). Tumoral capsule (n=2). Furthmore, on MRI inhomogenous signal T 1WI (n=13), T 2WI (n=14), inhomogenous enhancement (n=14), irregular outline with lobulation or/and nodule (n=14), incomplete capsule (n=5), and “tail sign” (n=7).Conclusion: Both CT and MRI would take a mutual part in diagnosing of malignant meningiomas, There were more information of malignant meningiomas on MRI than on CT, such as minute architecture within the lesions, outline, capsule state, and “tail sign”, but coincide with mass effect, hyperosteogeny, tumoral margin, tumoral enhancement and calcification.