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目的：研究听神经瘤的ＭＲＩ表现与特征。方法：收集手术和病理证实的１３５例、１３８个听神经瘤的ＭＲＩ，其中微小听神经瘤为１０例，行Ｇｄ－ＤＴＰＡ增强扫描为４２例。结果：听神经瘤的ＭＲＩ的表现主要为：（１）肿瘤以内听道为中心生长，病侧第Ⅶ、Ⅷ神经束较对侧增粗，与肿瘤主体多无明确分界，增强后可见两者相连，颇为特征；（２）肿瘤在Ｔ１加权图像上呈低信号，略低信号或低等混合信号，Ｔ２加权呈高信号或高等混合信号；（３）注射Ｇｄ－ＤＴ－ＰＡ后肿瘤呈均匀，不均匀或环状强化；（４）肿瘤边界清晰，边缘光整；（５）绝大多数肿瘤患侧内听道前后径扩大，深径缩短；（６）微小听神经瘤的ＭＲＩ表现为第Ⅶ、Ⅷ神经束正常或局部结节状增粗，造影后呈结节状或点状增强。结论：ＭＲＩ是检查听神经瘤的有效方法，Ｇｄ－ＤＴＰＡ对微小听神经瘤的诊断很有价值。
Objective: To study the MRI findings and characteristics of acoustic neuroma. Methods: The MRI findings of 135 cases of acoustic neuroma confirmed by operation and pathology were collected. Among them, 10 cases were small acoustic neuroma and 42 cases were Gd-DTPA enhanced scan. Results: The main manifestations of acoustic neuroma MRI were: (1) the tumor grows within the auditory canal; the Ⅶ and Ⅷ nerve bundles on the diseased side are thicker than the contralateral side; there is no clear demarcation between them and the main tumor body; (2) The tumor showed low signal, slightly low signal or low signal on T1-weighted image, high signal or high signal on T2 weighted; (3) The tumor was homogeneous after injection of Gd-DT-PA , Uneven or ring-shaped enhancement; (4) clear tumor border, edge finishing; (5) most of the tumor ipsilateral anteroposterior diameter before and after the auditory trabeculae, shortening; (6) MRI of small acoustic neuroma showed Ⅶ, Ⅷ nerve bundle normal or local nodular thickening, nodular or punctate enhancement after angiography. Conclusion: MRI is an effective method to detect acoustic neuroma, Gd-DTPA is very valuable for the diagnosis of small acoustic neuroma.