儿童蜗神经发育不良的影像学表现  

Imaging manifestations of cochlear nerve dysplasia in children

作　　者：燕飞[1] 李建红[1] 李静[1] 鲜军舫[1] 王振常[1] 

机构地区：[1]首都医科大学附属北京同仁医院放射科,北京100730

出　　处：《放射学实践》2011年第3期260-263,共4页Radiologic Practice

摘　　要：目的:探讨儿童蜗神经发育不良(CND)的MRI及高分辨力CT表现。方法:回顾性分析34例(60耳)蜗神经发育不良的颞骨HRCT及内耳和内耳道MRI表现。分析比较3种影像学表现诊断CND的能力。结果:MRI显示蜗神经发育不良60耳,伴前庭神经异常28耳,伴面神经细小3耳,伴内耳畸形28耳。HRCT显示内耳道狭窄32耳,蜗神经孔狭窄28耳,骨性封闭25耳。MRI诊断CND明显优于CT(P<0.001);以HRCT显示蜗神经孔狭窄或封闭作为诊断CND的依据明显优于以HRCT显示IAC狭窄作为诊断CND的依据(P=0.043)。结论:MRI能准确显示CND,HRCT显示蜗神经孔狭窄或封闭高度提示CND,内耳道正常不能排除CND。Objective：To explore high resolution computed tomography（HRCT） and MRI characteristics of children with cochlear nerve dysplasia（CND）.Methods：The images of 34 patients（60 ears） with CND,including temporal bone by HRCT,internal ear and internal auditory canal by MRI,were retrospectively reviewed.All of the 34 patients received internal ear MR imaging.HRCT was also performed.MR findings of cochlear nerve and HRCT features of cochlear nerve foramina and internal auditory canal were compared in the ability of CND diagnosis.Results：Of the 34 cases（68 ears）,60 ears with CND were revealed by MRI associated with abnormal vestibular nerve in 28 ears,thinning facial nerve in 3 ears,inner ear malformation in 28 ears.HRCT showed stenotic internal auditory canal in 32 ears,stenotic cochlear nerve foramina in 28 ears,atresic cochlear nerve foramina in 25 ears.MRI had obvious dominance in the diagnosis of CND relative to CT（P0.001）,stenotic and atresic cochlear nerve foramina shown by HRCT was more significant for CND diagnosis than stenotic internal auditory canal revealed by HRCT（P=0.043）.Conclusion：Cochlear nerve dysplasia can be accurately demonstrated by MRI.The stenosis or atresia of cochlear nerve foramina shown by HRCT may highly suggest CND,while normal appearance of internal auditory canal can not exclude CND.

关 键 词：蜗神经 内耳道 蜗神经孔 体层摄影术 X线计算机 磁共振成像 

分 类 号：R445[医药卫生—影像医学与核医学] R748[医药卫生—诊断学]