title: Surgical approach for synovial cyst of the atlantoaxial joint: a case report and review of the literature.
abstract: METHODS
  Case report and review of the literature.
  
  
  OBJECTIVE
  We describe the first case of a synovial cyst arising from pseudarthrosis of a previous dens fracture. The literature is reviewed and etiological, diagnostic, and therapeutic options of atlantoaxial cysts are discussed.
  
  
  BACKGROUND
  Symptomatic synovial cysts of the atlantoaxial joint are rare. To the authors' knowledge only 24 cases have been reported.A 60-year-old patient presented with bilateral hand numbness, quadrihyperreflexia, and gait deterioration. Magnetic resonance imaging of the cervical spine disclosed a cystic mass located at the transverse ligament of dens axis causing bulbomedullary compression.
  
  
  METHODS
  Surgery was performed via transoral image guided approach. The ventral atlas arch, dens, transverse ligament, tectorial membrane, and the compressing cyst were removed, followed by a C0-C3 fusion.
  
  
  RESULTS
  Two months postsurgery the patient recovered completely from the cervical myelopathy with transient remnant dysparesthesia of the finger tips.
  
  
  CONCLUSIONS
  Magnetic resonance imaging findings are not specific enough to establish a preoperative diagnosis. Radical resection via image-guided transoral route followed by posterior fusion allows complete resection of the cystic lesion and results in excellent long-term decompression.
authors: Departments of Neurosurgery, Inselspital, University of Berne, Berne, Switzerland.
authors: Serge
authors: S
authors: Marbacher
authors: Anton
authors: A
authors: Lukes
authors: Istvan
authors: I
authors: Vajtai
authors: Christoph
authors: C
authors: Ozdoba
mesh_terms: D001268:Atlanto-Axial Joint / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D001270:Cervical Atlas / Q000000981:diagnostic imaging / Q000473:pathology; D019299:Decompression, Surgical / Q000379:methods*; D005260:Female; D020233:Gait Disorders, Neurologic / Q000209:etiology; D006801:Humans; D006987:Hypesthesia / Q000209:etiology; D008022:Ligaments / Q000000981:diagnostic imaging / Q000473:pathology; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D019635:Neurosurgical Procedures / Q000379:methods*; D009809:Odontoid Process / Q000000981:diagnostic imaging / Q000473:pathology; D011542:Pseudarthrosis / Q000209:etiology / Q000473:pathology / Q000601:surgery*; D011859:Radiography; D012021:Reflex, Abnormal / Q000502:physiology; D013117:Spinal Cord Compression / Q000000981:diagnostic imaging / Q000209:etiology / Q000473:pathology; D016103:Spinal Fractures / Q000150:complications; D013123:Spinal Fusion / Q000379:methods; D025321:Surgery, Computer-Assisted / Q000379:methods; D013581:Synovial Cyst / Q000209:etiology / Q000473:pathology / Q000601:surgery*; D013680:Tectorial Membrane / Q000601:surgery; D016896:Treatment Outcome