恶性脑膜瘤MR诊断

MRI diagnosis of malignant meningioma

目的探讨恶性脑膜瘤的MRI表现特征,提高对本病诊断正确率。方法回顾性分析20例经手术病理证实且具有完整的MR检查资料的恶性脑膜瘤病例。结果恶性脑膜瘤形态多不规则,边缘呈分叶状或结节状,部分或全部境界模糊。T1WI均呈不规则混杂信号,以等低信号为多(18/20),T2WI以高等混杂信号为多见(18/20),瘤周水肿明显(17/20);增强扫描:肿瘤均显著强化,且以不均匀强化常见(19/20),部分肿瘤可示脑膜尾征(15/20)。结论恶性脑膜瘤除具有良性脑膜瘤MR表现外,还具有一定特异性MRI表现,可以为术前诊断提供依据。

Objective： To investigate MRI features of malignant meningioma,in order to improve diagnostic rate of the disease preoperatively.Methods： To collected 20 cases with intact MRI materials proved operatively and pathologically were analyzed.Results： The tumors were irregular or lobulated in contour with all or part of the border ill-defined.Most tumors showed heterogeneous and low signal intensity on T_1WI（18/20 cases）,and heterogeneous and high signal intensity on T_2WI,（18/20cases）.15 of 20 cases showed significant but inhomogeneous contrast enhancement.Conclusion： Malignant meningiomas do have characteristic MRI features besides in common with benign ones,and it may provide a considerable evidence for operating procedure.