title: C1-2 instability from os odontoideum mimicking intramedullary spinal cord tumor.
abstract: Os odontoideum is a common cause of atlantoaxial instability in the pediatric population. The authors present the cases of 2 patients whose initial clinical presentation and MR imaging findings were suggestive of an intramedullary neoplasm, but whose ultimate diagnosis was determined to be cervical spine instability and cord injury due to os odontoideum.
authors.affiliation: Department of Pediatric Neurological Surgery, Columbia University College of Physicians & Surgeons, New York, New York 10032, USA. pg2223@columbia.edu
authors.forename: Paul R
authors.initials: PR
authors.lastname: Gigante
authors.forename: Neil A
authors.initials: NA
authors.lastname: Feldstein
authors.forename: Richard C E
authors.initials: RC
authors.lastname: Anderson
mesh_terms: D000293:Adolescent; D001268:Atlanto-Axial Joint / Q000000981:diagnostic imaging* / Q000473:pathology; D016025:Bone Transplantation; D002574:Cervical Vertebrae / Q000000981:diagnostic imaging; D002648:Child; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007085:Ilium / Q000637:transplantation; D007593:Joint Instability / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D008279:Magnetic Resonance Imaging; D009809:Odontoid Process / Q000000981:diagnostic imaging* / Q000473:pathology*; D009989:Orthotic Devices; D012086:Reoperation; D013120:Spinal Cord Neoplasms / Q000000981:diagnostic imaging; D013123:Spinal Fusion / Q000379:methods; D014057:Tomography, X-Ray Computed; D014182:Transplantation, Autologous; D016896:Treatment Outcome