Imaging analysis of simple cochlear nerve canal stenosis / 实用放射学杂志

ABSTRACT

Objective To study the imaging manifestations and clinical significance of simple cochlear nerve canal(CNC)stenosis. Methods The HRCT findings of 14 patients(1 7 ears)with simple CNC stenosis diagnosed sensorineural hearing loss(SNHL)were retrospectively analyzed.The width of CNC and internal auditory canal was measured and compared with the normal ears,the data were statisti-cally analyzed by SPSS1 6.0.Thin-sliced MRI of internal auditory canal (axial and oblique sagittal position)was performed in 8 cases. Results HRCT displayed obvious CNC stenosis in all 14 patients(1 7 ears),2 ears with cochlear nerve canal atresia.Width of CNC and internal auditory canal was (0.5±0.3)mm and (4.6±1.0)mm,it was (2.1±0.2)mm and (5.1 ±1.3)mm in normal ears (1 1 ears),the width of CNC was of significant difference between normal ears and ears with SNHL,and there was no statistical sig-nificant difference in width of internal auditory canal.12 ears(from 1 7 ears with simple CNC stenosis)were lacking of fissure in the cribriform area,1 1 ears(normal ear)were existence of fissure in the cribriform area;cochlear nerves were not shown in 8 patients with MRI examination.Conclusion CNC stenosis can be isolated from internal auditory canal stenosis,MRI could display cochlear nerve dysplasia(CND).