title: The extent of inferior displacement of the mastoid tegmen is related to the severity of congenital aural atresia.
abstract: CONCLUSIONS
  The extent of inferior displacement of the mastoid tegmen is related to the severity of congenital aural atresia (CAA).
  
  
  OBJECTIVE
  To analyze anatomic variations observed on high-resolution temporal bone computed tomography (TBCT) in patients with CAA, the extent of inferior displacement of the mastoid tegmen and the size of the incudo-stapedial (IS) joint angle were compared with surgical parameters for atresiaplasty, such as Jahrsdoerfer score and hearing acuity.
  
  
  METHODS
  Sixty-one patients with unilateral CAA underwent high-resolution TBCT and hearing tests. We evaluated TBCTs in terms of Jahrsdoerfer criteria and analyzed the relationships among the inferior displacement of the mastoid tegmen, size of the IS joint angle, hearing acuity, and the Jahrsdoerfer score on the atretic side.
  
  
  RESULTS
  IS joint angle on the atretic side was found to be 120.6 ± 11°, which was significantly greater than the corresponding value of 103.4 ± 5.4° on the normal side. Cholesteatoma occurred significantly more often in CAA patients with narrow external auditory canals (EACs) (9/27; 33.3%), compared with CAA patients with no EAC opening (2/34; 5.9%). There was a significant relation between the extent of inferior displacement of the mastoid tegmen (28.9% in the atretic side and 17.3% in the normal side) and the Jahrsdoerfer score (p < 0.0001).
authors.affiliation: Department of Otolaryngology-Head and Neck Surgery, Korea University College of Medicine , Seoul , Korea.
authors.forename: Young-Ho
authors.initials: YH
authors.lastname: Ju
authors.forename: Euyhyun
authors.initials: E
authors.lastname: Park
authors.forename: Sangheon
authors.initials: S
authors.lastname: Park
authors.forename: Kwangjin
authors.initials: K
authors.lastname: Jung
authors.forename: Kijeong
authors.initials: K
authors.lastname: Lee
authors.forename: Gi Jung
authors.initials: GJ
authors.lastname: Im
mesh_terms: D000293:Adolescent; D000328:Adult; D001301:Audiometry, Pure-Tone; D001309:Auditory Threshold / Q000502:physiology; D002648:Child; D002675:Child, Preschool; D000013:Congenital Abnormalities / Q000000981:diagnostic imaging* / Q000601:surgery; D004423:Ear / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000601:surgery; D004424:Ear Canal / Q000002:abnormalities / Q000000981:diagnostic imaging / Q000601:surgery; D005260:Female; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D021621:Imaging, Three-Dimensional; D007188:Incus / Q000002:abnormalities / Q000000981:diagnostic imaging; D008297:Male; D008416:Mastoid / Q000002:abnormalities* / Q000000981:diagnostic imaging* / Q000601:surgery; D061330:Multidetector Computed Tomography / Q000379:methods*; D012016:Reference Values; D013198:Stapedius / Q000002:abnormalities / Q000000981:diagnostic imaging; D013701:Temporal Bone / Q000000981:diagnostic imaging* / Q000601:surgery; D014432:Tympanic Membrane / Q000002:abnormalities / Q000000981:diagnostic imaging / Q000601:surgery; D055815:Young Adult