title: Cervical myelopathy involving os odontoideum and retro-odontoid cyst treated with Harms C1-C2 arthrodesis.
abstract: An episode of acute decompensation of cervical myelopathy occurred after an injury without fracture of an os odontoideum associated with a compressive retro-odontoid cyst. The 51-year-old female patient presented Fränkel C, Nurick grade 4 neurological status and pyramid syndrome. The initial MRI demonstrated an intramedullary T2 hyperintense signal in the context of spinal cord narrowing. The retro-odontoid cyst demonstrates atlantoaxial instability related to the os odontoideum. Harms C1-C2 arthrodesis without laminectomy was performed and the cyst disappeared completely. Spinal cord decompression was thus obtained on the MRI taken 3 months later. Neurological recovery was complete and continued at 1 year.
authors.affiliation: Département de chirurgie orthopédique et traumatologique, institut régional du rachis, CHU Charles-Nicolle, 1, rue de Germont, 76031 Rouen cedex, France.
authors.forename: S
authors.initials: S
authors.lastname: Le Pape
authors.affiliation: Département de chirurgie orthopédique et traumatologique, institut régional du rachis, CHU Charles-Nicolle, 1, rue de Germont, 76031 Rouen cedex, France.
authors.forename: R
authors.initials: R
authors.lastname: Gauthé
authors.affiliation: Département de chirurgie orthopédique et traumatologique, institut régional du rachis, CHU Charles-Nicolle, 1, rue de Germont, 76031 Rouen cedex, France.
authors.forename: C
authors.initials: C
authors.lastname: Latrobe
authors.affiliation: Clinique chirurgicale infantile, CHU Charles-Nicolle, 1, rue de Germont, 76031 Rouen cedex, France.
authors.forename: J
authors.initials: J
authors.lastname: Leroux
authors.affiliation: Département de chirurgie orthopédique et traumatologique, institut régional du rachis, CHU Charles-Nicolle, 1, rue de Germont, 76031 Rouen cedex, France.
authors.forename: X
authors.initials: X
authors.lastname: Roussignol
authors.affiliation: Département de chirurgie orthopédique et traumatologique, institut régional du rachis, CHU Charles-Nicolle, 1, rue de Germont, 76031 Rouen cedex, France. Electronic address: mouradouldslimane@yahoo.fr.
authors.forename: M
authors.initials: M
authors.lastname: Ould-Slimane
mesh_terms: D001845:Bone Cysts / Q000000981:diagnostic imaging / Q000601:surgery*; D002574:Cervical Vertebrae / Q000000981:diagnostic imaging / Q000601:surgery*; D005260:Female; D006801:Humans; D007593:Joint Instability / Q000209:etiology / Q000601:surgery; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D009809:Odontoid Process / Q000000981:diagnostic imaging / Q000601:surgery*; D013118:Spinal Cord Diseases / Q000601:surgery*; D013123:Spinal Fusion / Q000379:methods*
keywords: C1–C2 arthrodesis; Laminectomy; Os odontoideum; Retro-odontoideum cyst; Spinal cord compression