title: High-resolution CT of the temporal bone in dysplasia of the auricle and external auditory canal.
abstract: OBJECTIVE
  To determine CT findings in the external, middle, and inner ear of patients with microtia and external auditory canal dysplasia.
  
  
  METHODS
  We used high-resolution CT, with multiplanar or axial 1-mm continuous sections, coronal or sagittal reformations, or low-dose spiral acquisitions, to examine 184 temporal bones of children with microtia.
  
  
  RESULTS
  In cases of minor microtia, auditory canal stenosis was the most common associated abnormality; in those with major microtia, atresia was predominant. Middle ear malformations depended on the severity of the auricular anomalies. Inner ear changes could also be noted. Ossicle dysplasias occurred in 98% of patients (stapes, 72%), absence of the oval window in 36%, labyrinthine malformations in 13%, closed round window in 6%, facial canal displacement in up to 75%, and aberrations of the vascular canal in 38% of patients with third-grade auricular deformity.
  
  
  CONCLUSIONS
  A variety of external, middle, and, less frequently, inner ear changes were detected in connection with microtia.
authors.affiliation: Institute of Radiology and Neuroradiology, Medical University, Lübeck, Germany.
authors.forename: T E
authors.initials: TE
authors.lastname: Mayer
authors.forename: H
authors.initials: H
authors.lastname: Brueckmann
authors.forename: R
authors.initials: R
authors.lastname: Siegert
authors.forename: A
authors.initials: A
authors.lastname: Witt
authors.forename: H
authors.initials: H
authors.lastname: Weerda
mesh_terms: D000015:Abnormalities, Multiple / Q000000981:diagnostic imaging; D002648:Child; D004424:Ear Canal / Q000002:abnormalities* / Q000000981:diagnostic imaging; D004429:Ear Ossicles / Q000002:abnormalities / Q000000981:diagnostic imaging; D004431:Ear, External / Q000002:abnormalities* / Q000000981:diagnostic imaging; D007758:Ear, Inner / Q000002:abnormalities / Q000000981:diagnostic imaging; D004432:Ear, Middle / Q000002:abnormalities / Q000000981:diagnostic imaging; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation*; D011856:Radiographic Image Enhancement / Q000295:instrumentation*; D013701:Temporal Bone / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed / Q000295:instrumentation*