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先天性内耳道狭窄的多层螺旋CT和MRI表现

CT and MRI diagnosis of congenital stenosis of the internal auditory canal

摘要:

目的 总结先天性内耳道狭窄的多层螺旋CT(multiple slices CT,MSCT)和MRI影像学特点,提高对该病的认识.方法 回顾性分析13例(15耳)先天性内耳道狭窄患者MSCT和MRI检查的影像资料.结果 先天性内耳道狭窄单侧11例,双侧2例.MSCT显示内耳道管腔不同程度狭窄.孤立性内耳道狭窄3耳,合并其他畸形12耳,其中10耳仅合并内耳畸形,1耳同时合并内、中、外耳畸形,另1耳同时合并内、中、外耳畸形及额骨发育畸形.MRI检查15耳均显示前庭蜗神经发育细小;其中7耳蜗神经未显示,7耳蜗神经发育细小,1耳蜗神经显示不清;其中2耳面神经发育细小.容积再现(volume rendering,VR)图像可立体显示内耳道狭窄程度及伴发的内耳畸形.结论 MSCT 可显示内耳道狭窄的程度及伴发畸形,MRI则可显示其神经发育情况.

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Objective To investigate multiple slice computed tomography ( MSCT) and magnetic resonance imaging( MRI) features of congenital stenosis of the internal auditory canal (CSIAC) and improve the ability for diagnosis.Method Thirteen cases with fifteen ears were studied.In all cases a MSCT and MRI was performed.Results Eleven cases were unilateral,and 2 cases were bilateral.MSCT could show the narrowness of IAC.Three cases were isolated,but the others were combined with inner ear malformations.One ear had inner,middle and outer ear malformations.One ear had inner,middle,and outer ear malformations with a frontal bone malformation.MRI demonstrated that all of the vestibulocochlear nerves were hypoplastic.The cochlear nerve in seven ears was not present,in seven ears the nerve was thinner,and in the last case it was poorly visualized.The facial nerve in two ears was hypoplastic.Volume rendering( VR) could present the degree of the narrowed internal auditory canals,combined with other inner ear anomalies.Conclusion MSCT will show the degree of the narrow internal auditory canals and combined anomalies,while the MRI can further demonstrate the nerves' development.

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