摘要
目的 分析桥小脑角区神经鞘瘤的CT、MRI表现 ,旨在提高诊断正确率。方法 41例听神经瘤和 5例三叉神经瘤均经手术病理证实。 18例经CT检查 (16例增强扫描 ) ,2 8例MRI检查 (增强扫描 2 5例 ) ,2例DSA检查。结果 听神经瘤以内听道为中心生长 ,患侧内听道和脑池增宽 ,Ⅶ、Ⅷ神经束较对侧增粗 ;三叉神经瘤表现为特征性哑铃形伴岩骨尖骨质破坏。CT显示肿瘤呈等密度、低密度或以低密度为主的混杂密度。MRI示T1WI呈低、稍低或混杂信号 ,T2WI为均匀或不均匀高信号。增强扫描肿瘤呈均匀或不均匀网格状或环形强化。DSA见肿瘤血供丰富 ,染色明显。CT、MRI正确诊断率分别为 81%和 92 %。结论 CT和MRI对神经鞘瘤均有重要诊断价值 ,而MRI优于CT 。
Objective To analyze CT and MRI findings of intracranial schwannoma in cerebellopontine area (CPA) for improving its diagnostic accuracy. Methods Of all the 41 cases of acoustic neuroma and 5 cases of trigeminoma proved by pathological examination, 18 cases were examined with CT (16 contrast CT), 28 by MRI (25 contrast MRI) and 2 by DSA. The results of all images were analyzed. Results The acoustic neuroma grew mainly around the internal auditory canal, with enlarged internal auditory canal and cerebellopontine pool, and thickened Ⅶ Ⅷ nerves of the same side of the lesion. The characteristic trigeminoma appeared as dumb bell with erosion of petrous bone. The lesion showed iso , hypo , or mixed low density in CT and hypo , or minor hypo signal on T 1WI, while hyper or mixed hyper signal on T 2WI in MRI. On the contrast scan, the tumors had homo or heterogenous reticular or ringlike enhancement. The diagnotic accuracy of CT and MRI was 81% and 92% respectively. Conclusion CT and MRI play important roles in the diagnosis of schwannoma in CPA with the latter method more superior. DSA may be useful when there are some difficulties in the diagnosis.
出处
《第三军医大学学报》
CAS
CSCD
北大核心
2002年第11期1374-1375,共2页
Journal of Third Military Medical University
关键词
桥小脑角区神经鞘瘤
影像学诊断
磁共振成像
CT
schwannoma
cerebellopontine angle
imaging diagnosis
X ray computed tomography
magnetic resonance imaging
