桥小脑角区肿瘤的MRI诊断

目的探讨桥小脑角区肿瘤的MRI表现及特征,提高对桥小脑角区肿瘤的定性诊断水平。方法34例经手术和病理证实的桥小脑角区肿瘤,其中听神经瘤20例,脑膜瘤4例,三叉神经瘤3例,血管母细胞瘤2例,胆脂瘤、蛛网膜囊肿、动脉瘤、胶质瘤及转移瘤各1例。在静注Gd-DTPA前后均经SE,FSE序列磁共振成像。结果听神经瘤,脑膜瘤,三叉神经瘤为桥小脑角区最常见的肿瘤,该区肿瘤大部分有特征性MRI表现,术前定位、定性准确率分别为96.9%,94.1%。结论MRI在桥小脑角区肿瘤影像诊断中具有不可比拟的优势,可作为桥小脑角区肿瘤术前的首选检查方法。

MRI diagnosis of the tumors in the area of the pontocerebellar angle

Objective To analyze the characteristic MRI findings of the tumors occurred in the area of the pontocerebellar angle so as to improve the diagnostic accuracy.Methods Thirty-four patients with surgically and pathologically proved pontocerebellar tumors in which acoustic neuroms were found in 20,meningiomas in 4,trigeminalneuroms in 3,hemangioblastomas in 2,and arachnoid cyst,cholesteatoma,aneurysm,glioma,metastasis in 1 each underwent SE and FSE MR imaging before and after intravenous administration of Gd-DTPA.Results Acoustic neuroma,meningioma and trigeminalneuroma were the most common tumors in the area of the pontocerebellar angle.Most tumors in this area had characteristic MRI findings.The accuracy of localized and qualitative diagnosis before the operation was 96.9%and 94.1%,respectively.Conclusion MR imaging has an incomparable advantage in the diagnosis of pontocerebellar tumors so that it should be the preferred means of performing the preoperative evaluation.