title: Primary mastoid cyst.
abstract: OBJECTIVE
  To report an unusual case of a primary mastoid cyst (congenital or developmental) in a patient without otological symptoms.
  
  
  METHODS
  Case report and review of the English language literature.
  
  
  RESULTS
  Primary mastoid cyst is a newly reported and very rare pathological entity. Mastoid cysts usually occur secondary to chronic infection, inflammation or trauma. Review of the medical literature highlights the rarity of this condition.
  
  
  CONCLUSIONS
  This report describes the experience gained by the diagnosis and management of this patient. It emphasises the importance of clinical vigilance so that proper treatment may be instituted in a timely manner.
authors.affiliation: Department of Otolaryngology, Head and Neck Surgery, Modbury Hospital, University of Adelaide, South Australia, Australia. cy-tan@hotmail.com
authors.forename: C Y
authors.initials: CY
authors.lastname: Tan
authors.forename: S
authors.initials: S
authors.lastname: Chong
authors.forename: C-K L
authors.initials: CK
authors.lastname: Shaw
mesh_terms: D000328:Adult; D001845:Bone Cysts / Q000209:etiology / Q000473:pathology*; D002908:Chronic Disease; D005260:Female; D006801:Humans; D008416:Mastoid / Q000002:abnormalities* / Q000473:pathology; D035583:Rare Diseases; D012852:Sinusitis / Q000150:complications; D014057:Tomography, X-Ray Computed