title: The incidence of tympanogenic labyrinthitis ossificans.
abstract: OBJECTIVE
  To estimate the incidence of tympanogenic labyrinthitis ossificans.
  
  
  METHODS
  The records of patients treated with mastoidectomy for various tympanogenic aetiologies from January 2007 to December 2011 were retrospectively reviewed. Patients whose high-resolution computed tomography scans showed evidence of labyrinthine calcification of the temporal bone were enrolled. Patients with a history of head and neck cancer, meningitis, and otosclerosis, and patients with cochlear implants, were excluded from this study.
  
  
  RESULTS
  A total of 195 patients were enrolled in this study; 4 of the patients presented with calcification in the inner ear. Therefore, the incidence of tympanogenic labyrinthitis ossification was 2 per cent. The computed tomography findings revealed: (1) cochlear calcifications of the basal and middle turn in two patients; and (2) vestibular, superior semicircular canal, posterior semicircular canal and lateral semicircular canal calcification in one, four, three and two patients, respectively.
  
  
  CONCLUSIONS
  The incidence of tympanogenic labyrinthitis ossification in patients who had undergone a mastoidectomy was 2 per cent.
authors: Department of Otolaryngology-Head and Neck Surgery,Mackay Memorial Hospital Hsinchu Branch,Taiwan.
authors: H-Y
authors: HY
authors: Lin
authors: Department of Radiology,Mackay Memorial Hospital Hsinchu Branch,Taiwan.
authors: Y-K
authors: YK
authors: Fan
authors: Department of Otolaryngology-Head and Neck Surgery,Mackay Memorial Hospital Hsinchu Branch,Taiwan.
authors: K-C
authors: KC
authors: Wu
authors: Department of Otolaryngology-Head and Neck Surgery,Mackay Memorial Hospital Taipei Branch,New Taipei City,Taiwan.
authors: M-T
authors: MT
authors: Shu
authors: Department of Otolaryngology-Head and Neck Surgery,Mackay Memorial Hospital Taipei Branch,New Taipei City,Taiwan.
authors: C-C
authors: CC
authors: Yang
authors: Department of Otolaryngology-Head and Neck Surgery,Mackay Memorial Hospital Taipei Branch,New Taipei City,Taiwan.
authors: H-C
authors: HC
authors: Lin
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D007762:Labyrinthitis / Q000000981:diagnostic imaging / Q000453:epidemiology* / Q000601:surgery; D008297:Male; D008416:Mastoid / Q000601:surgery; D008875:Middle Aged; D009999:Ossification, Heterotopic / Q000000981:diagnostic imaging / Q000453:epidemiology* / Q000601:surgery; D012189:Retrospective Studies; D012307:Risk Factors; D013624:Taiwan / Q000453:epidemiology; D014057:Tomography, X-Ray Computed; D014432:Tympanic Membrane / Q000473:pathology*; D055815:Young Adult