脑干血管网状细胞瘤的MRI表现

目的:分析脑干血管网状细胞瘤的MRI表现特点,讨论MRI诊断价值及鉴别诊断。方法:经手术和病理证实7例,其中男性2例,女性5例,年龄19~45岁,平均28.7岁。7例均经MRI平扫及增强扫描。结果:7例脑干血管母细胞瘤中1例位于延髓,2例位于延髓与桥脑交界处,4例均位于桥脑。6例为单发囊性,呈大囊小结节,囊液呈长T1长T2,瘤结节呈不规则形,T1WI为稍低或等信号强度,T2WI呈较高信号强度。瘤旁无水肿或水肿较轻。增强扫描瘤结节明显强化呈高信号强度,部分囊壁呈环形强化。1例为实质性,T1WI呈中等偏低信号,T2WI呈中等偏高信号,增强扫描肿瘤显著增强。肿瘤实质内及肿瘤旁可见迂曲的血管流空影。结论:MRI对脑干血管网状细胞瘤的诊断具有较高的准确性,尤其是增强扫描对定性诊断及鉴别诊断具有重要价值。

MRI in the Diagnosis of Brain Stem Hemangioblastomas

Objective:The magnetic resonance imaging(MRI) characteristics of 7 cases with brain stem hemangiobastomas was analyzed,and its diagnostic value and differential diagnosis was discussed.Methods: 7 cases of brain sten hemangioblastomas tomas were verified by operation and pathology,among them,2 males and 5 female,aging from 19~45 years,average 28.7 years.Results: Among 7 cases with brain stem hemangioblastomas,1 case was located in medulla oblongata,2 located in the junction of pons and medulla oblongata,4 located in pons.6 cases appeared a single cyst,which characterized with a large cyst and a small nodule.The cystic liquid exhibited the long T1 and T2 signal.The tumor nodule was irregular,which on T1-weighted image showed low intensity signal or isintense,and T2-weighted image was hyperintense.There was no edema or slight edema surrounding the tumors.1 case appeared a solid mass.The tumor nodule and solid hemangioblastomas became clear significantly with enhanced MRI,and appeared to be hyperintense,and the cystic wall also became clear roundly.Conclusion: MR diagnosis in brain stem hemangioblastomas is highly precise,especially enhanced scan has a important value in determination and confirming the diagnosis.