title: Prevalence of inner ear anomalies among cochlear implant candidates.
abstract: OBJECTIVE
  To determine the prevalence of inner ear anomalies and the frequency of different anomaly types among cochlear implant recipients.
  
  
  METHODS
  This study included a retrospective chart review of all patients who received cochlear implants between January 2009 and January 2013 in King Abdulaziz University Hospital cochlear implant program in Riyadh, Saudi Arabia. All subjects underwent thin-cut CT of the temporal bone and MRI. The collected data included age, gender, and CT and MRI findings regarding temporal bone anomalies. Patients with any identified congenital inner ear anomalies were included in the study.
  
  
  RESULTS
  In total, 316 patients' cases were reviewed. Inner ear malformations were identified in 24 patients, which represented a prevalence of 7.5%. Among these 24 patients, 8 (33.3%) presented with a large vestibular aqueduct (LVA), 8 (33.3%) semicircular canal (SCC) dysplasia, 7 (29.1%) classical Mondini deformity, and one (4.1%) cochlear hypoplasia.
  
  
  CONCLUSIONS
  The prevalence of inner ear anomalies among cochlear implant recipients was 7.5%. This result is consistent with findings worldwide. The most common anomalies were LVA and SCC hypoplasia; by contrast, in other regions, the most common anomaly is either the Mondini deformity, or LVA.
authors.affiliation: Department of Otolaryngology & Head and Neck Surgery, King Saud University Medical City, Riyadh, Kingdom of Saudi Arabia. E-mail. Dr.aldhafeeri@hotmail.com.
authors.forename: Ahmad M
authors.initials: AM
authors.lastname: Aldhafeeri
authors.forename: Abdulrahman A
authors.initials: AA
authors.lastname: Alsanosi
mesh_terms: D003054:Cochlear Implants; D007758:Ear, Inner / Q000002:abnormalities* / Q000000981:diagnostic imaging; D006801:Humans; D008279:Magnetic Resonance Imaging; D015995:Prevalence; D012189:Retrospective Studies; D012529:Saudi Arabia; D014057:Tomography, X-Ray Computed