title: Evaluation of unilateral sensorineural hearing loss in the pediatric patient.
abstract: OBJECTIVE
  This study is a review of our series of pediatric patients with unilateral sensorineural hearing loss (USNHL) to report abnormalities on imaging studies, review genetic and ophthalmologic results, and survey audiometric findings.
  
  
  METHODS
  This study is a retrospective chart review of all pediatric patients with USNHL seen between 1/1/03 and 12/31/08 at our institution. The study was approved by the institutional review board.
  
  
  RESULTS
  Eighty-nine cases were identified with audiometric findings confirming unilateral hearing thresholds greater than 20 dBHL with no conductive component. There were 48 males and 41 females. Average age of diagnosis was 7 years. One audiogram showed low-frequency loss, 17 mid-frequency, 29 high-frequency, and 32 flat. Ten patients were diagnosed by auditory brainstem response testing at another institution, with thresholds not available for review. Eleven percent of patients progressed to bilateral loss. Sixty-one patients underwent computed tomography of temporal bones (CTTB). Twenty of 61 scans identified 34 anomalies including 15 enlarged vestibular aqueducts (EVAs), 8 Mondini, and 3 superior semicircular canal dehiscences (SSCDs). Thirty-one of 89 patients underwent magnetic resonance imaging (MRI). Three of these 31 patients had positive findings including 1 EVA, 1 Mondini, and 1 asymmetric internal auditory canal. When CTTB was positive, no additional lesions were detected on MRI. When CTTB was negative and MRI was done in 20 patients, 2 additional lesions were detected by MRI. Fourteen patients had genetics evaluation of which 6 had positive findings, including CHARGE, VACTERL, Goldenhar, and 3 were heterozygous for a Connexin mutation.
  
  
  CONCLUSIONS
  CTTB is an effective diagnostic tool for USNHL. MRI should be considered in patients with negative CTTB. Genetics and ophthalmologic evaluations are recommended for patients with risk factors or an abnormal clinical examination. Close follow-up is essential due to high rate of hearing loss progression.
authors.affiliation: Section of Pediatric Otolaryngology, Head & Neck Institute, Cleveland Clinic, Cleveland, OH 44195, United States.
authors.forename: Timothy
authors.initials: T
authors.lastname: Haffey
authors.forename: Nicole
authors.initials: N
authors.lastname: Fowler
authors.forename: Samantha
authors.initials: S
authors.lastname: Anne
mesh_terms: D000293:Adolescent; D000367:Age Factors; D001299:Audiometry / Q000379:methods; D002648:Child; D002675:Child, Preschool; D015331:Cohort Studies; D018450:Disease Progression; D016057:Evoked Potentials, Auditory, Brain Stem / Q000502:physiology*; D005260:Female; D005500:Follow-Up Studies; D005820:Genetic Testing; D006319:Hearing Loss, Sensorineural / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000209:etiology; D046088:Hearing Loss, Unilateral / Q000175:diagnosis* / Q000000981:diagnostic imaging; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D012189:Retrospective Studies; D018570:Risk Assessment; D012720:Severity of Illness Index; D012737:Sex Factors; D014057:Tomography, X-Ray Computed / Q000379:methods*