面神经瘤的CT和MRI诊断

目的：研究面神经瘤的CT和MRI表现，提高对其的认识。方法：9例面神经瘤中，8例面神经鞘瘤，1例面神经纤维瘤。7例行颞骨高分辨CT扫描，2例常规扫描；6例行MRI检查，其中5例做了增强扫描。结果：本组发生在右侧5例，左侧4例；内听道1例，迷路段4例，膝状神经节6例，鼓突段（降段）6例，茎乳孔5例，腮腺3例。CT表现：面神经管扩大，膝状窝骨壁膨胀，面神经径路上有条索状或结节样软组织影。MRI表现：面神经呈结节样或条索状增粗，呈跨节段性分布，T1WI为等信号，T2WI为等或高信号；有明显强化。结论：面神经径路上出现实质性节段性肿块是面神经瘤的影像特点。MR增强扫描是一种有效的检查手段。

CT and MRI diagnosis of facial nerve neuroma

Objective To investigate the CT and MRI findings of facial neuroma to promote diagnostic accuracy. Methods Nine facial neuromas consisted of 8 schwannoma and 1 neurofibroma. High resolution CT were performed on 7 cases, routinal CT scan on 2 patients. Six cases were examined by MRI, in which 5 cases were used constrast media. Results Five tumors on right side and 4 on left were detected. The tumor affected the internal auditory canal segment of facial nerve in 1 case, labyrinth segment in 4, anterior genu in 6, tympanum segment in 7, mastoid segment in 6,horizontal segment in 5 and parotid segment in 3. CT demonstrated enlargement of the facial nerve canal, benign bone remodeling in the location of geniculate ganglion and stripe soft issue along the course of facial nerve. MRI found that involved facial nerve became thickened markedly as a stripe or soft mass by several segments, that were isointense to brain on T 1WI and isointense or hyperintense on T 2WI and enhanced obviously. Conclusion The segmental soft tissue mass along the facial nerve course is the characteristic of facial neuroma. Gadolinium enhanced MRI is an effective method for detecting the lesion.