title: Expansile bone cyst and cholesteatoma of the temporal bone.
abstract: OBJECTIVE
  To identify primary bony cysts of the temporal bone.
  
  
  METHODS
  A single case of a woman presenting with unilateral bulging of the temporoparietal cranium, progressive stenosis of the external auditory canal, and maximal conductive hearing loss.
  
  
  METHODS
  Plain x-rays, magnetic resonance imaging, contrast-enhanced computed tomography, audiogram, and modified radical mastoidectomy.
  
  
  METHODS
  Radiologic and histopathologic diagnosis of a primary bone cyst of the temporal bone obstructing the external auditory canal with a retained cholesteatoma of the middle ear.
  
  
  RESULTS
  Identification of an inflammatory bony cyst of the temporal bone with a retained cholesteatoma of the middle ear resulting in stenosis of the external auditory canal and maximal conductive hearing loss.
  
  
  CONCLUSIONS
  Primary bone cyst of the temporal bone can lead to external auditory canal stenosis, middle ear cholesteatoma, and conductive hearing loss.
authors.affiliation: Department of Otolaryngology-Head & Neck Surgery, University of California, San Francisco, California, USA. hhwang@ohns.ucsf.edu
authors.forename: Harry S
authors.initials: HS
authors.lastname: Hwang
authors.forename: Christine M
authors.initials: CM
authors.lastname: Glastonbury
authors.forename: James P
authors.initials: JP
authors.lastname: Grenert
authors.forename: Lawrence R
authors.initials: LR
authors.lastname: Lustig
mesh_terms: D000328:Adult; D001345:Autoradiography; D001847:Bone Diseases / Q000150:complications / Q000473:pathology* / Q000601:surgery; D002781:Cholesteatoma / Q000150:complications / Q000473:pathology* / Q000601:surgery; D003560:Cysts / Q000150:complications / Q000473:pathology* / Q000601:surgery; D005260:Female; D006319:Hearing Loss, Sensorineural / Q000175:diagnosis / Q000209:etiology; D006801:Humans; D008279:Magnetic Resonance Imaging; D013506:Otologic Surgical Procedures; D013701:Temporal Bone / Q000473:pathology* / Q000601:surgery; D014057:Tomography, X-Ray Computed