title: A cervical myelopathy due to invaginated laminae of the axis into the spinal canal.
abstract: METHODS
  A case report and review of previous literature are presented.
  
  
  OBJECTIVE
  The objective of this manuscript was to report a case of cervical myelopathy due to anomalous laminae of the axis in a patient with spina bifida.
  
  
  BACKGROUND
  In previous studies, few cases of invaginated anomalous laminae of the axis have been reported. Treatment was surgical removal of the invaginated laminae.
  
  
  METHODS
  The patient's history, clinical examination, imaging findings, and treatment were reported.
  
  
  RESULTS
  Characteristic findings were revealed from imaging studies, a multiplane reconstruction of the CT images, and a stereolithographic model of the cervical spine. The patient was treated with a posterior decompressive operation. The outcome was satisfactory, with an improvement in the patient's neurology.
  
  
  CONCLUSIONS
  This is a report of a rare characteristic anomaly of the laminae of the axis. A multiplane reconstruction of the CT images and a stereolithographic model were useful for treatment of this case. Possible causes of this anomaly may be the failure of ossification or fusion of the embryological term.
authors.affiliation: Department of Orthopaedic Surgery, University of Tsukuba, Tsukuba, Japan. shinsuke33@aol.com
authors.forename: Shinsuke
authors.initials: S
authors.lastname: Sakai
authors.forename: Masataka
authors.initials: M
authors.lastname: Sakane
authors.forename: Shigeru
authors.initials: S
authors.lastname: Harada
authors.forename: Koji
authors.initials: K
authors.lastname: Kaneoka
authors.forename: Kuniaki
authors.initials: K
authors.lastname: Amano
authors.forename: Naoyuki
authors.initials: N
authors.lastname: Ochiai
mesh_terms: D001368:Axis, Cervical Vertebra / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000601:surgery; D019299:Decompression, Surgical; D006801:Humans; D021621:Imaging, Three-Dimensional; D008279:Magnetic Resonance Imaging; D008297:Male; D008875:Middle Aged; D009333:Neck / Q000000981:diagnostic imaging; D013115:Spinal Canal / Q000000981:diagnostic imaging*; D013117:Spinal Cord Compression / Q000000981:diagnostic imaging / Q000209:etiology* / Q000601:surgery; D013118:Spinal Cord Diseases / Q000150:complications* / Q000000981:diagnostic imaging / Q000601:surgery; D014057:Tomography, X-Ray Computed