title: Neurologic complications of craniovertebral dislocation.
abstract: Craniovertebral dislocation is uncommon, but its diagnosis is important taking into account the potential severity of the neurologic complications. A number of causes are known; the most common are Down syndrome, rheumatoid arthritis, Paget's disease, other metabolic bone diseases, and craniocervical trauma. Down's syndrome is a relatively common clinical condition but craniovertebral subluxation is only observed in a small percentage of patients. About half of all cervical spine injuries affect the atlanto-occipital region and C2 vertebra. In rheumatoid arthritis, craniocervical dislocation occurs in up to 40% of patients with severe disease. In Paget's disease, involvement of the craniovertebral region occurs in about 30% of all cases. The clinical neurologic syndrome is characterized by local pain, features of upper spinal cord and medullary compression, positive Lhermitte phenomenon, syncope associated with neck flexion, vertebral artery obstruction or dissection leading to stroke, and asymmetrical lower cranial nerve palsies. Neuroimaging is essential to confirm the clinical diagnosis and to categorize severity. The treatment of this disorder is usually surgical, but traction and external immobilization is relevant in some cases. Specific conditions may require additional treatments such as radiotherapy, antibiotics, or chemotherapy.
authors.affiliation: Department of Neurosciences, St Maria Hospital, Lisbon, Portugal; Institute of Molecular Medicine, Lisbon, Portugal. Electronic address: mamedemg@mail.telepac.pt.
authors.forename: Mamede
authors.initials: M
authors.lastname: de Carvalho
authors.affiliation: Institute of Molecular Medicine, Lisbon, Portugal; Department of Neurology, Royal London Hospital, Queen Mary School of Medicine, University of London, London, UK.
authors.forename: Michael
authors.initials: M
authors.lastname: Swash
mesh_terms: D001268:Atlanto-Axial Joint / Q000473:pathology*; D001269:Atlanto-Occipital Joint / Q000473:pathology*; D006801:Humans; D004204:Joint Dislocations / Q000150:complications* / Q000473:pathology; D008279:Magnetic Resonance Imaging; D009422:Nervous System Diseases / Q000209:etiology*
keywords: Atlantoaxial subluxation; Down syndrome; Grisel’s syndrome; craniovertebral dislocation; neurologic complications; rheumatoid arthritis; traumatic craniovertebral subluxation