单侧聋患儿的影像学病因分析

Computer tomography demonstrations of single-sided deafness

目的:分析常见内耳及内听道畸形在单侧聋(SSD)患儿人群中的分布情况,并通过比较SSD患儿聋耳和听力正常耳关键骨性结构参数值,初步研究SSD患儿的影像学病因。方法:收集诊断为SSD且行颞骨高分辨计算机薄层扫描(HRCT)检查的患儿40例,对其进行颞骨HRCT阅片,并测量轴位骨岛面积、前庭宽度、内听道宽度,耳蜗高度及耳蜗底轴宽度,行配对t检验比较SSD患儿聋耳和听力正常耳测量值的差异。结果:SSD聋耳组内耳及内听道畸形率高达62.5%(25/40),最常见的畸形为蜗神经管畸形,其中蜗神经管狭窄20例(50.0%)、蜗神经管闭锁3例(7.5%);其次常见的畸形为内听道畸形,其中内听道狭窄5例(12.5%)、内听道闭锁1例(2.5%);耳蜗畸形有原始听囊畸形1例(2.5%)、不完全分隔(IP)Ⅱ型畸形2例(5.0%)及前庭水管扩大(EVA)畸形1例(2.5%)。听力正常耳组中有1例EVA畸形和1例IP-Ⅱ畸形。聋耳组中内耳各关键结构测量结果相比于听力正常耳组,蜗神经管宽度、内听道宽度及骨岛面积差异有统计学意义(P<0.05)。除此之外,各项内耳关键结构测量结果差异均无统计学意义。结论:蜗神经管狭窄和内听道狭窄是SSD患儿的主要影像学病因,颞骨HRCT对SSD患儿的影像学病因有较高的诊断价值。

Objective:To investigate the distribution of common inner ear and internal auditory canal malformations in children with single-sided deafness(SSD),and to explore the imaging etiology of SSD by comparing the quantitative parameters of key bone structures between deaf and normal ears in children with congenital SSD.Method:Forty children with SSD diagnosed in the Second Hospital of Lanzhou University from September 2016 to March 2019 were collected.All of them underwent HRCT examinations of temporal bone.The area of bone island,the width of vestibular,the width of internal auditory canal,the height of cochlear and the width of cochlear basal axis were measured.Paired t test was used to compare the difference between the hearing abnormality and normal hearing in children with SSD.Result:The rate of inner ear deformity was 62.5%in SSD group,the most common deformity was cochlear nerve canal deformity,20 cases(50.0%)of cochlear canal stenosis and 3 cases(7.5%)of cochlear canal atresia.The second most common deformity was internal auditory canal deformity,including 5 cases(12.5%)of internal auditory canal stenosis and 1 case(2.5%)of internal auditory canal atresia.Other malformations included 1 case(2.5%)of RO,2 cases(5.0%)of incomplete partition(IP)type II and 1 case(2.5%)of enlargement of vestibular aqueduct(EVA).There are no significant difference in the measured results of the key structures of the inner ear between two groups except the width of cochlear nerve canal,internal auditory canal and the area of bone island.Conclusion:The main inner ear deformities in children with SSD are cochlear nerve canal stenosis and inner auditory canal stenosis.HRCT of temporal bone has high diagnostic value for inner ear deformities in children with SSD.