Wu Xiaohong, Wu Hao, Li Zhaoji, Lü Chunlei
Department of Otolaryngology, People's Hospital of Yiwu,Yiwu 322000.
Lin Chuang Er Bi Yan Hou Ke Za Zhi. 2002 Jul;16(7):340-1.
To discuss the examination parameters of acoustic neuromas.
The MRI features of 20 lesions 20 patients with acoustic neuroma had been analyzed retrospectively. The examinations were performed by a 1.5 Tesla superconducting magnet system transaxial T1. T2-weighted imagines and coronal or sagittal T1. T2-weighted imagines were obtained in each cases. 20 patients were examined with Gd-DTPA.
20 cases of acoustic neuroma were divided into three groups according to the tumor size: 1.1 approximately 2 cm (4 lesion) ;2. 2 approximately 4 cm (14 lesion); 3. over 4 cm (2 lesion). T1 weighted imagines shovos the equal or low signal;T2 weighted imagines shows the high signal. Low and high mixture signal will be shown when being hemorrhage or necrosis.
Combining thin slice and Gd-DTPA in MRI examination was the best method to find acoustic neuroma. MRI not only can find small intracanalicular tumors, but also has advantages in demonstrating the formation of cyst and hemorrhage, the compression of adjacent anatomical structures and the tumor vessels.
探讨听神经瘤的检查参数。
回顾性分析20例听神经瘤患者20个病灶的MRI特征。检查采用1.5特斯拉超导磁体系统进行横轴位T1、T2加权成像以及冠状位或矢状位T1、T2加权成像，每例均行Gd-DTPA检查。
20例听神经瘤根据肿瘤大小分为三组：1. 约2cm（4个病灶）；2. 约2至4cm（14个病灶）；3. 超过4cm（2个病灶）。T1加权成像显示等信号或低信号；T2加权成像显示高信号。出血或坏死时可见低高混合信号。
MRI检查中联合薄层扫描和Gd-DTPA是发现听神经瘤的最佳方法。MRI不仅能发现小的内耳道肿瘤，而且在显示囊肿和出血的形成、对相邻解剖结构的压迫以及肿瘤血管方面具有优势。
