桥小脑角区肿瘤的MRI诊断和鉴别诊断

目的 :探讨桥小脑角区肿瘤MRI的表现及特征。材料和方法 :分析 193例资料完整 ,均经手术和病理证实的桥小脑角区肿瘤 ,其中听神经瘤 135例 ,三叉神经瘤为 30例 ,脑膜瘤 12例 ,胆脂瘤 4例 ,蛛网膜囊肿 2例 ,动脉瘤 1例 ,血管母细胞瘤 4例 ,脉络丛乳头状瘤 3例 ,海绵状血管瘤 1例 ,转移瘤 1例。结果 :桥小脑角区肿瘤中 ,脑外肿瘤 95 .3% ,脑内肿瘤 4.7% ;良性肿瘤占 98.4% ,恶性肿瘤占 1.6%。发生于桥小脑角区的前三位肿瘤分别为听神经瘤 69.9% ,三叉神经瘤 15 .5 % ,脑膜瘤 6.2 % ,该区肿瘤大部分有特征性MRI表现 ,术前定位、定性诊断准确率分别为 10 0 %、96.4%。结论 :MRI是检查桥小角区肿瘤的首选方法 ,对桥小脑角区肿瘤诊断和鉴别有重要价值

MRI Diagnosis and Differential Diagnosis of the Pontocerebellar Tumors

Purpose: To explore the characteristic MRI findings of the pontocerebellar tumors. Materials and Methods: 193 pontocerebellar tumors having complete clinical data and verified by operation and pathology were analyzed. Of them 135 were acoustic neuromas,30 trigeminal neuromas,12 meningiomas,4 cholesteatomas,2 arachnoid cysts,1 aneurysm,4 hemangioblastomas,3 papillomas choroideum,1 cavernoma and 1 metastasis. Results: Of the pontocerebellar tumors,95.3% were intracellular tumors,4.7% were extracellelar. rumors;98.4%were benign tumors,1.6% were malignant tumors. The first three rate tumors in pontocerebellar were acoustic neuroma(69.9%),trigeminal neuroma(15.5%)and meningiomas(6.2%). The most pontocerebellar tumors had the characteristic MRI findings. The accuracy rates of location and quaoltative diagnosis before operation were 100% and 96.4%. Conclusion: MRI is the first choice for the detecting the pontocerebellar tumors and it is important for the diagnosis and differential diagnosis.