椎管内脑膜瘤MRI表现及临床分析

MR APPEARANCE AND CLINICAL ANALYSIS OF MENINGIOMA INTRA VERTEBRAL CANAL

目的:探讨椎管内脑膜瘤的MRI表现特征,分析其临床意义。方法:回顾性分析13例术前行MRI检查并经手术和病理证实的椎管内脑膜瘤,观察肿瘤发生部位、形态边缘、信号特点、邻近脊髓及硬脊膜情况及增强后表现。结果:肿瘤位于颈段6例,胸段7例,位于髓外硬膜下12例,硬膜外1例,肿瘤均边缘清楚,平扫T1WI呈等或略低信号,T2WI呈等或略高信号,Gd-DTPA增强后肿瘤脊髓面可见强化带,硬脊膜增厚可表现为"硬膜尾征",瘤体具一定的强化特征。结论:椎管内脑膜瘤表现与颅内脑膜瘤既有相似之处,也有不同,肿瘤多位于髓外硬膜下间隙,多见于脊髓背侧或外侧,MRI表现有一定特征性,最后诊断依靠病理。

Objectives To study the MR character of meningioma intra vertebral canal end analyse its clinical signifieznee.Method： 13 meningioma intra vertebral canal were studied retrospectively, all were proved by pathology arut the patients undertook MR examination preoparation.Tumor living position, configuration, signal character, spinal cord and dura mater neighborhood, appearance after enhancement were observed.Results： 6 merfingiorna locates in neck segment, 7 in thorax segment, 12 lie infra dura mater, 1 lies epidural.Tumor margin were distinct. In plain scan T1WI appears equal or a little low signal, T2WI appears equal or a little high signal. After Gd - DTPA crthancernent, rcinforcement tape can be seen on the tumor face to spinal cord, dura mater of spinal cord thicken and show “dura mater tail”, Tumor body shows some enhancement character.Conclusion： Meningioma in vertebral canal is similar to those in cranium in some case and there are diffirence. Most tumor lie in inter space of dura mater, locate in dorsum or lateral of spinal cord. MR appearance is characteristic. Final diagnosis depend on pathology.