脑干血管网状细胞瘤的MRI表现

MRI in the Diagnosis of Brain Stem Hemangioblastomas

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。

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 hemangiohlastomas is highly precise, especially enhanced scan has a important value in determination and confirming the diagnosis.