title: [CT and MRI diagnosis of congenital stenosis of the internal auditory canal].
abstract: 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.
  
  
  METHODS
  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.
  
  
  CONCLUSIONS
  MSCT will show the degree of the narrow internal auditory canals and combined anomalies, while the MRI can further demonstrate the nerves' development.
authors.affiliation: Department of CT, Affiliated Hospital of Jining Medical College, China. jywanglinsheng@163.com
authors.forename: Lin-sheng
authors.initials: LS
authors.lastname: Wang
authors.forename: Li-hong
authors.initials: LH
authors.lastname: Zhang
authors.forename: Xiao-yu
authors.initials: XY
authors.lastname: Li
authors.forename: Yue-qin
authors.initials: YQ
authors.lastname: Chen
authors.forename: Xian
authors.initials: X
authors.lastname: Li
authors.forename: Zhan-guo
authors.initials: ZG
authors.lastname: Sun
authors.forename: Jie-huan
authors.initials: JH
authors.lastname: Wang
authors.forename: Gu-qing
authors.initials: GQ
authors.lastname: Zhang
authors.forename: Ping
authors.initials: P
authors.lastname: Liu
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D003251:Constriction, Pathologic / Q000000981:diagnostic imaging / Q000473:pathology; D007758:Ear, Inner / Q000002:abnormalities / Q000000981:diagnostic imaging* / Q000473:pathology*; D005260:Female; D006801:Humans; D007223:Infant; D008279:Magnetic Resonance Imaging; D008297:Male; D036542:Tomography, Spiral Computed; D055815:Young Adult