非脑膜瘤脑膜病变的MRI表现及强化模式

目的 分析不同脑膜病变的MR成像表现，探讨MRI尤其是脑膜强化模式对各种脑膜病变的诊断及鉴别诊断价值。方法 临床资料完整的脑膜病变61例，其中感染性脑膜炎27例；非感染性脑膜炎4例，包括嗜酸性肉芽肿2例，wegener肉芽肿l例，病因不明l例；脑膜转移瘤12例；脑膜淋巴瘤2例；脑梗死8例；手术后脑膜改变8例。MR常规扫描后均行钆喷替酸葡甲胺(Gd-DTPA)增强扫描。结果 (1)MR平扫：异常脑膜改变仅3例，其中脑膜增厚l例，脑膜结节2例。(2)MR增强扫描：61例呈3种脑膜强化模式，分别为I型、Ⅱ型、Ⅲ型强化模式。I型强化模式即硬脑膜-蛛网膜强化，有19例；Ⅱ型强化模式即蛛网膜-软脑膜强化，有32例；Ⅲ型强化模式即全脑膜强化(包括硬脑膜及软脑膜)，有10例。结论 不同脑膜病变MR成像表现尤其是增强模式有一定特点。各种脑膜病变增强模式对于鉴别各种脑膜病变，发现病变细节，提示临床诊疗均有明显意义。

MRI enhancing patterns of non-meningioma meningeal lesions

Objective To analyze the MRI appearances of meningeal diseases and to study MRI diagnostic value of enhancing patterns in different meningeal processes Methods Sixty-one patients with integrated clinical data,including 27 infectious meningitis,4 inflammatory meningitis (2 eosinophilic granuloma,1 Wegener granuloma,and 1 unknown etiological factor),12 meningeal metastasis,2 meningeal lymphoma,8 cerebrovascular disease,and 8 postoperative changes,were reviewed retrospectively All patients were examined on MRI before and after contrast administration Results (1)MR plain scan: positive findings of plain scan were revealed in only 3 cases,including 1 linear meningeal thickening pattern and 2 nodular pattern (2)MR enhancement: All cases showed 3 kinds of enhancing patterns: 19 dural-arachnoid pattern,32 pia-arachnoid pattern,and 10 total meninges pattern,respectively ConclusionDifferent meningeal diseases have different MR imaging manifestations Creating the enhancement patterns of various diseases can have great clinical significance