title: Radiographic features of superior semicircular canal dehiscence in the setting of chronic ear disease.
abstract: OBJECTIVE
  To determine if radiologic chronic otitis media (COM), both with and without cholesteatoma, is associated with superior semicircular canal dehiscence (SSCD).
  
  
  METHODS
  Retrospective review of consecutive high-resolution computed tomography (HRCT) scans of the temporal bone.
  
  
  METHODS
  Tertiary care medical center.
  
  
  METHODS
  Two hundred consecutive patients undergoing HRCT of the temporal bone beginning January 1, 2012.
  
  
  METHODS
  Imaging was evaluated by 3 reviewers (2 neuroradiologists and 1 neurotologist). All scans were assessed for the presence of SSCD, cholesteatoma, chronic otomastoiditis, tegmen dehiscence, and for abnormalities of the cochlea, vestibule, facial nerve, and temporal bone vasculature.
  
  
  METHODS
  Ears with COM associated with chronic otomastoiditis or cholesteatoma were compared with those without COM with respect to the presence of SSCD or other temporal bone abnormalities. Statistical analysis was performed to assess for differences between the groups studied.
  
  
  RESULTS
  One-hundred ninety-four patients (388 ears) were included. Cholesteatoma was identified in 48 ears (12.4%) and chronic otomastoiditis in 62 ears (16%). Ten ears with cholesteatoma had ipsilateral SSCD, and 8 ears with chronic otomastoiditis had ipsilateral SSCD. In 340 ears without either cholesteatoma or chronic otomastoiditis, SSCD was found in 18 (5.3%). SSCD was found to occur significantly more often in patients with ipsilateral radiologic cholesteatoma. No cases of SSCD were associated with cochlear, facial nerve, or vascular abnormalities.
  
  
  CONCLUSIONS
  Our findings suggest that COM with cholesteatoma is associated with the presence of SSCD, although the nature of this association is unclear.
authors.affiliation: *Department of Surgery, Division of Otolaryngology-Head and Neck Surgery, †Department of Radiology, Section of Neuroradiology, ‡Department of Surgery, Division of Otolaryngology-Head and Neck Surgery, Section of Otology and Neurotology, University of Wisconsin Hospital and Clinics; and §Waisman Center, University of Wisconsin-Madison, Madison, Wisconsin, U.S.A.
authors.forename: Brian C
authors.initials: BC
authors.lastname: Gartrell
authors.forename: Lindell R
authors.initials: LR
authors.lastname: Gentry
authors.forename: Tabassum A
authors.initials: TA
authors.lastname: Kennedy
authors.forename: Samuel P
authors.initials: SP
authors.lastname: Gubbels
mesh_terms: D002781:Cholesteatoma / Q000000981:diagnostic imaging* / Q000453:epidemiology; D002908:Chronic Disease; D015897:Comorbidity; D006801:Humans; D015994:Incidence; D007759:Labyrinth Diseases / Q000000981:diagnostic imaging* / Q000453:epidemiology; D010033:Otitis Media / Q000000981:diagnostic imaging* / Q000453:epidemiology; D011859:Radiography; D012189:Retrospective Studies; D012665:Semicircular Canals / Q000000981:diagnostic imaging*