桥小脑角肿瘤MRI三维薄层扫描的诊断价值

Diagnostic Value of MRI with 3D and Thin-Sliced Techniques in Cerebello-pontine Angle Tumors

目的:探讨桥小脑角肿瘤MRI三维薄层扫描的诊断价值,提高诊断准确率。方法:应用三维薄层扫描序列,结合常规MRI序列,分析52例桥小脑角肿瘤MRI表现并与手术结果对照。结果:桥小脑角区肿瘤中,听神经瘤27例,脑膜瘤11例,三叉神经瘤4例,胆脂瘤4例,蛛网膜囊肿3例,海绵状血管瘤2例,转移瘤1例。位于左侧桥小脑角区占17%,位于右侧桥小脑角区占19%,平扫MRI对桥小脑角肿瘤的检出率、定位率、定性率分别为92%、92%、86%。三维薄层扫描对桥小脑角肿瘤的检出率、定位率、定性率分别为100%、100%、96%。结论:MRI三维薄层扫描与常规MRI比较,能清晰显示肿瘤性病变与周围神经及邻近血管之间的关系,明显提高了检出率和鉴别诊断的准确率,为临床确定治疗方案有极其重要的指导意义,因此三维薄层扫描在桥小脑角肿瘤诊断中的应用值得广泛推广。

Objective：To explore the clinical value of MRI with 3D and thin sliced techniques in the diagnosis of cerebello-pontine angle （CPA） tumors and to promote the diagnostic accuracy rate of the tumors. Methods：MR scans, performed with routine and 3D-thin sliced techniques respectively,of 52 surgically proven cases of CPA tumors were collected and reviewed. The findings obtained with the 2 different techniques were evaluated and correlatively compared with the surgical appearances. Results： There were 27 cases of acoustic neurinoma, 11 cases of meningioma, 4 cases of trigeminal neuroma, 4 cases of cholesteatoma,3 cases of arachnoid cyst, 2 cases of cavernous hemangioma and 1 case of metastatic tumor in our CPA tumor collection. 17 % of the CPA tumors were found in the left and 19 % in the right side. The MR detection,localization and diagnostic specificity rates with conventional scanning technique were 92%,92% and 86 % respectively, while those relative rates using MRI 3D and thin sliced techniques were 100%,100% and 96% respectively. Conclusion： MR scanning with 3D and thin sliced techniques played an important role in conspicuously demonstrating CPA tumor details and the relationship of tumor surroundings such as relative cranial nerves and vascular structures. Therefore, the clinical application of these MR scanning techniques were worth of advocating in the examination of CPA tumors.