title: [Radiological study of temporal bone in children with profound deafness before cochlear implant: CT vs magnetic resonance imaging].
abstract: OBJECTIVE
  To evaluate the clinical application of magnetic resonance imaging (MRI) and CT in children with profound deafness before cochlear implant and their impact on surgical decision.
  
  
  METHODS
  The pre-operative CT and MRI data from 71 children with bilateral profound deafness planned for cochlear implant were studied.
  
  
  RESULTS
  12 patients showed enlarged vestibular aqueduct (16.9%); 14 patients had Mondini malformation (19.7%); 3 patients demonstrated enlarged internal auditory meatus (4.2%); and 2 patients were suspected to have fistulae (2.8%) on both CT and MRI examinations. In comparison between MRI and CT, unilateral cochlear fibrosis was detected in 5 patients(7%) by MRI, but none by CT scans. Bilateral dehiscent facial nerve was detected in 1 patient(1.4%) by CT scan, while MRI was normal.
  
  
  CONCLUSIONS
  CT and MRI are essential for the pre-operative planning of cochlear implant, especially in patients with enlarged vestibular aqueduct, Mondini malformation, enlarged internal auditory meatus and suspected fistulae. These two imaging modalities are complementary to each other in cases with cochlear fibrosis and facial nerve dehiscence.
authors.affiliation: Department of Otorhinolaryngology, Queen Mary Hospital, Hongkong, China. wmlam@ha.org.hk
authors.forename: Wendy Wai-man
authors.initials: WW
authors.lastname: Lam
authors.forename: Yau
authors.initials: Y
authors.lastname: Hui
authors.forename: Dennis Kin-kwok
authors.initials: DK
authors.lastname: Au
authors.forename: Lawrence C
authors.initials: LC
authors.lastname: Chow
authors.forename: Fu-luk
authors.initials: FL
authors.lastname: Chan
authors.forename: Lisheng
authors.initials: L
authors.lastname: Yu
authors.forename: William I
authors.initials: WI
authors.lastname: Wei
mesh_terms: D002648:Child; D002675:Child, Preschool; D015834:Cochlear Diseases / Q000175:diagnosis*; D019929:Cochlear Implantation; D005260:Female; D006801:Humans; D007223:Infant; D008279:Magnetic Resonance Imaging; D008297:Male; D013701:Temporal Bone / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed