title: Superior canal dehiscence in a patient with three failed stapedectomy operations for otosclerosis: a case report.
abstract: BACKGROUND
  This case illustrates that superior semicircular canal dehiscence syndrome can be associated with a "pseudo"-conductive hearing loss, a symptom that overlaps with the clinical appearance of otosclerosis.
  
  
  METHODS
  We present the case of a 48-year-old German Caucasian woman presenting with hearing loss on the left side and vertigo. She had undergone three previous stapedectomies for hearing improvement. Reformatted high-resolution computed tomographic scanning and the patient's history confirmed the diagnosis of concurrent canal dehiscence syndrome.
  
  
  CONCLUSIONS
  Failure of hearing improvement after otosclerosis surgery may indicate an alternative underlying diagnosis which should be explored by further appropriate evaluation.
authors.affiliation: Department of Otolaryngology, Head and Neck Surgery, Bielefeld Academic Teaching Hospital, Münster University, Münster, Germany. holger.sudhoff@rub.de.
authors.forename: Martin
authors.initials: M
authors.lastname: Lehmann
authors.forename: Jörg
authors.initials: J
authors.lastname: Ebmeyer
authors.forename: Tahwinder
authors.initials: T
authors.lastname: Upile
authors.forename: Holger H
authors.initials: HH
authors.lastname: Sudhoff