title: Ganglion cyst of the odontoid process. Case report and review of the literature.
abstract: METHODS
  This case report illustrates that although it is rare, a ganglion cyst can occur intraosseously in the odontoid process.
  
  
  OBJECTIVE
  The tissue diagnosis was established by surgical resection of the cyst membrane and evacuation of the cyst content. The patient tolerated the procedure well, and the hospital course was uneventful.
  
  
  BACKGROUND
  Synovial cyst of the spine is uncommon and is usually found in the lumbar region. Its occurrence in the cervical spine is rare, and no cases in the odontoid process, to the authors' knowledge, have been reported.
  
  
  METHODS
  This patient was evaluated initially for neck pain, which led to radiographic studies depicting the lesion. It raised the suspicion of metastatic neoplastic process, although the search for primary source proved to be negative. A biopsy was indicated.
  
  
  RESULTS
  Surgical findings consisted of mucoid material field cavity lined by a thin membrane. The cyst was excised, and pathologic evaluation confirmed the diagnosis of synovial cyst.
  
  
  CONCLUSIONS
  The correct radiographic diagnosis of this patient was not made because of lack of experience with such lesions in this location. The authors hope that this case report helps raise the awareness of clinicians in considering this diagnosis when facing similar radiographic presentation.
authors.affiliation: Department of Neurosurgery, Montefiore Medical Center, Bronx, New York, USA.
authors.forename: K
authors.initials: K
authors.lastname: Tabaddor
authors.forename: D
authors.initials: D
authors.lastname: Sachs
authors.forename: J F
authors.initials: JF
authors.lastname: Llena
authors.forename: M A
authors.initials: MA
authors.lastname: Testaiuti
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D001845:Bone Cysts / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D005260:Female; D006801:Humans; D009809:Odontoid Process / Q000000981:diagnostic imaging / Q000473:pathology; D013122:Spinal Diseases / Q000601:surgery; D014057:Tomography, X-Ray Computed