【摘要】 目的探讨三叉神经瘤CT及MR I的影像表现与解剖对应关系。方法分析17例经手术病理证实的三叉神经瘤的CT和/或MR I资料。结果17例中颅后窝5例,颅中窝8例,位于颅中窝、颅后窝的肿瘤呈椭圆形或伴分叶状改变;跨颅窝4例,呈哑铃形或不规则形。CT及MR I表现有以下特点:①肿瘤实性部分略高密度3例,略低密度4例,近脑灰质密度改变2例,伴有囊状低密度区4例。②T1W I均匀低信号5例,不均匀等低信号7例,T2W I均匀高信号4例,不均匀高信号8例。③CT及MR I增强不均匀明显强化10例,均匀强化7例。④肿瘤沿着三叉神经并跨颅窝“哑铃状”生长4例,三叉神经根增粗与瘤体相连续3例,M eckel腔扩大6例。⑤岩骨骨质吸收3例。肿瘤边界清,周围脑组织无水肿及钙化15例。结论CT和MR I是诊断三叉神经瘤的可靠方法。更多还原

【Abstract】 Objective To investigate the CT and MRI findings of trigeminal nerve tumors and relative anatomic characteristics.Methods CT and MRI findings in 17 cases of trigeminal neuroma proved surgically and pathologically were analysed.Results Of 17 cases,the tumors located in middle and posterior carnial fossa in 8 cases and 5 cases respectively,these tumors appeared as oval or lobulated structure.The tumors localized in transcranial fossa in 4 cases with dumbbell or irregular shape.CT and MRI findings were as following:（1）Higher density of tumors in 3,low density in 4,the same density with adjacent graymatter in 2 and cystic low density in 4;（2）Homogeneous and inhomogeneous low signal intensity on T₁WI in 5 and 7 respectively,homogeneous and inhomogeneous high signal intensity on T₂WI in 4 and 8 respectively;（3）Inhomogeneous and homogeneous enhancement in 10 and 7 cases respectively on CT and MRI contrast-enhanced scan;（4）The tumors grew along trigeminal nerve and across the cranial fossa with dumbbel appearance in 4,the root of trigeminal nerve were thickened and connected with the tumors body in 3,enlargement of Meckel’s cave in 6;（5） The erosion of petrous bone in 3 cases clear boundary of tumors and without calcificaton or adjacent edema in 15 cases.Conclusion CT and MRI are reliable methods in diagnosing trigeminal neuroma.更多还原