Mafee M F, Lachenauer C S, Kumar A, Arnold P M, Buckingham R A, Valvassori G E
Department of Radiology, University of Illinois, Chicago 60680.
Radiology. 1990 Feb;174(2):395-400. doi: 10.1148/radiology.174.2.2404313.
Two cases of intralabyrinthine schwannoma were studied with computed tomography (CT) and magnetic resonance (MR) imaging. On CT scans, a soft-tissue mass was identified in the round window niche in both cases. Widening of the basilar turn of the cochlea and characteristic erosion of the promontory were noticed in one case. Preoperative MR imaging (performed in only one case) revealed a soft-tissue mass in the labyrnth, extending into the round window niche. Findings at CT and MR imaging are discussed, and a differential diagnosis is given. The literature is reviewed. The authors' findings suggest that CT and MR imaging may prove very valuable in the previously difficult preoperative diagnosis of these tumors. In the setting of progressive sensorineural hearing loss, atypical Meniere disease, or recurrent vertigo, the presence of a mass in the labyrinth or labyrinthine windows- delineated on CT or MR images, despite a normal internal auditory canal, cerebellopontine angle, or brain stem - is highly suggestive of intralabyrinthine schwannoma.
对两例迷路内神经鞘瘤患者进行了计算机断层扫描（CT）和磁共振成像（MR）研究。在CT扫描中，两例患者的圆窗龛内均发现软组织肿块。其中一例患者可见耳蜗底转增宽以及岬部的特征性侵蚀。术前MR成像（仅对一例患者进行）显示迷路内有一软组织肿块，延伸至圆窗龛。对CT和MR成像的结果进行了讨论，并给出了鉴别诊断。对相关文献进行了综述。作者的研究结果表明，CT和MR成像对于这些肿瘤此前困难的术前诊断可能非常有价值。在进行性感音神经性听力损失、非典型梅尼埃病或复发性眩晕的情况下，尽管内耳道、桥小脑角或脑干正常，但在CT或MR图像上显示迷路或迷路窗内有肿块，高度提示迷路内神经鞘瘤。
