MRI manifestations and pathological basis of atypical meningioma
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摘要:目的 探讨非典型脑膜瘤的磁共振成像(MRI)特征及病理基础。方法 回顾性分析20例经手术和病理证实的非典型脑膜瘤患者的MRI资料, 包括影像特点(囊变、分叶状、强化方式与程度、瘤脑界面、邻近颅骨征象)及病理基础。结果 肿瘤位于大脑凸面12例，大脑镰旁6例，乙状窦旁2例，典型MRI结果呈边界清晰的软组织肿块。病变部位T1WI结果呈等信号或者低信号，T2WI表现为高信号，占位效应比水肿更显著，肿瘤内部囊变坏死，增强扫描显示不均质强化。结论 非典型脑膜瘤发病率低，其MRI具有一定的特征性。MRI平扫联合增强扫描可以对肿瘤进行术前定位及定性诊断。Abstract:Objective To investigate the magnetic resonance imaging (MRI) characteristics and pathological basis of atypical meningiomas.Methods The MRI materials of 20 patients with atypical meningioma confirmed by surgery and pathology were retrospectively analyzed, including imaging features (cystic degeneration, lobulation, enhancement mode and degree, tumor-brain interface, adjacent skull signs) and pathological basis.Results The tumors were located on convex surface in 12 cases, beside falciform surface in 6 cases, and beside sigmoid sinus in 2 cases. Typical MRI findings showed clear boundary soft tissue masses. The lesion showed iso-signal or hypo-signal on T1WI, and hyper-signal on T2WI. The space-occupying effect was more significant than edema. Cystic degeneration and necrosis were found in the tumors. Enhanced scan showed heterogeneous enhancement.Conclusion The incidence rate of atypical meningioma is low, and its MRI manifestations has certain characteristics. Preoperative localization and qualitative diagnosis of tumors can be achieved by plain and enhanced MRI scans.
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Keywords:
- meningiomas /
- magnetic resonance imaging /
- pathology /
- space occupying effect /
- necrosis
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