磁共振成像鉴别典型和非典型脑膜瘤

Imran Nazir, Suhail Rafiq, Mohammad Naseed, M. Dar, F. Shaheen
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摘要

背景:脑膜瘤是最常见的颅内肿瘤。它们通常均匀地增强轴外质量。然而,10%的脑膜瘤是非典型的,具有不同的影像学表现。在影像学上区分典型脑膜瘤和非典型脑膜瘤在手术和治疗计划中非常重要。材料和方法:我们的研究是一项回顾性研究,包括20例经病理证实的典型和非典型脑膜瘤,不包括丘疹病变。回顾磁共振图像,每个病变显示为硬膜增强肿块。分析的个体特征包括年龄、性别、最大大小、位置、T1、T2加权、易感性加权成像、扩散加权、表观扩散系数、增强T1、与邻近脑组织的界面,相邻脑组织的信号变化以及上覆骨的变化。目的:本研究的目的是回顾性评估经病理证实的典型和非典型脑膜瘤的磁共振成像(MRI)特征。结果:磁共振特征,如扩散受限、骨质破坏性改变、与脑实质界面不清、造影后不均匀增强、邻近脑实质水肿改变>6mm等,有利于非典型脑膜瘤。结论:MRI能够根据影像学表现区分典型和非典型脑膜瘤,这对手术和治疗计划很重要。
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Differentiation of typical and atypical meningiomas using magnetic resonance imaging
Background: Meningiomas are the most common intracranial neoplasms. They are usually homogeneously enhancing extraaxial masses. However, 10% of meningiomas are atypical with different imaging appearance. Distinguishing typical from atypical meningiomas on imaging is highly important in surgical and treatment planning. Materials and Methods: Our study was a retrospective one comprising twenty cases each of pathologically proven typical and atypical meningiomas excluding enplaque lesions. Magnetic resonance images were reviewed with each of the lesions showed as dural-based enhancing mass. Individual features analyzed were age, gender, maximum size, location, signal characteristics on T1, T2 weighted, susceptibility weighted imaging , diffusion-weighted, apparent diffusion coefficient, contrast-enhanced T1, interface with adjacent brain tissue, signal changes in adjacent brain tissue, and changes in overlying bone. Aim: The aim of the study is to retrospectively assess the magnetic resonance imaging (MRI) features of pathologically proven typical and atypical meningiomas. Results: Magnetic resonance features such as diffusion restriction, bony changes in form of destruction, indistinct interface with brain parenchyma, heterogeneous postcontrast enhancement, and edematous changes >6 mm thick in adjacent brain parenchyma were in favor of atypical meningioma. Conclusion: MRI has the ability to differentiate typical and atypical meningiomas based on imaging appearance which is important in surgical and treatment planning.
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