少见部位脑膜瘤的MRI表现及分析

Analyze the MR Appearances of Meningioma at Uncommon Sites

目的研究少见部位脑膜瘤MRI表现的临床意义。资料与方法回顾性分析10例少见部位脑膜瘤患者的MRI表现及手术病理资料。结果脑实质脑膜瘤3例,侧脑室脑膜瘤2例,嗅沟脑膜瘤2例,颅骨脑膜瘤2例,鞍隔脑膜瘤1例。10例中9例为实质性,仅1例脑实质内肿瘤为囊实性。肿瘤在T1WI、T2WI信号接近脑皮层信号,扩散加权成像(DWI)信号均高于脑实质,增强扫描呈明显强化。对邻近组织无破坏者6例;术中发现肿块血供丰富,6例肿块边界清楚,有较完整包膜,4例呈侵袭性生长。结论充分认识少见部位脑膜瘤的MRI表现对定性诊断有重要价值。

Objective To improve MR imaging diagnosis and clinical knowledge of meningioma at uncommon sites. Materials and Methods MR appearances and histopathologic data of 10 patients with meningiomas at uncommon sites were analyzed retrospectively. Results Among all the cases, meningiomas located at parenchyma in 3 cases , lateral ventricles in 2 cases, olfactory groove in 2 cases, skull in 2 cases and diaphragma sellar in 1 case. Nine（9/10） masses were solid and 1 （1/10） mass was cystic-solid. The signal intensity on T1-weighted and T2-weighted sequences was similar to the grey matter of the brain. In addition, the tumors were hyperintense on diffusion weighted imaging and had significant enhancement after intravenous administration of contrast material. Six cases had benign margins with the adjacent tissues. During the operation, all the tumors were found hypervascular, 6 cases had clear boundary with complete envelopes, and 4 cases had invasive boundary. Conclusion The MR appearances of meningioma at uncommon sites were very important in qualitative diagnosis.