title: Cervical subluxation associated with posterior cervical hemivertebra.
abstract: OBJECTIVE
  Hemivertebrae, associated with a failure in the formation and fusion of vertebral body ossification nuclei, are a common cause of thoracic or lumbar scoliosis. A cervical location is rare and even rarer as a cause of cervical subluxation in flexion and extension (for which only one previous case has been found).
  
  
  METHODS
  We report on the case of a 7-year-old female patient, who was examined for a cervical fusion defect, consisting of a posterior C4 hemivertebra and a left hemiblock from C5 to C7. After performing surgery consisting of a C4 corpectomy and anterior fixation with intersomatic graft and plate, adequate cervical stabilization with only a self-limiting left C6 brachialgia and ipsilateral Horner syndrome occurs in the postoperative period.
  
  
  CONCLUSIONS
  Posterior cervical hemivertebra associated with instability is a very rare finding. The anterior approach with corpectomy and anterior plate enables suitable stabilization.
authors.affiliation: Pediatric Neurosurgery Unit, Department of Neurosurgery, Virgen del Rocío University Hospital, C/ Manuel Siurot s/n, 41006, Seville, Spain.
authors.forename: R
authors.initials: R
authors.lastname: Otero-López
authors.affiliation: Pediatric Neurosurgery Unit, Department of Neurosurgery, Virgen del Rocío University Hospital, C/ Manuel Siurot s/n, 41006, Seville, Spain. monicargarvia@msn.com.
authors.forename: M
authors.initials: M
authors.lastname: Rivero-Garvía
authors.affiliation: Pediatric Neurosurgery Unit, Department of Neurosurgery, Virgen del Rocío University Hospital, C/ Manuel Siurot s/n, 41006, Seville, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Márquez-Rivas
authors.affiliation: Pediatric Neurosurgery Unit, Department of Neurosurgery, Virgen del Rocío University Hospital, C/ Manuel Siurot s/n, 41006, Seville, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Valencia
mesh_terms: D001860:Bone Plates; D002574:Cervical Vertebrae / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000601:surgery; D002648:Child; D004413:Dysostoses / Q000150:complications / Q000000981:diagnostic imaging / Q000601:surgery*; D005260:Female; D006801:Humans; D004204:Joint Dislocations / Q000000981:diagnostic imaging / Q000209:etiology / Q000601:surgery*; D016059:Range of Motion, Articular; D014057:Tomography, X-Ray Computed
keywords: Cervical subluxation; Hemivertebra; Vertebral development failures