EVALUATION STUDIES
JOURNAL ARTICLE
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Os odontoideum.

Neurosurgery 2002 March
DIAGNOSIS: There is insufficient evidence to support diagnostic standards.

GUIDELINES: There is insufficient evidence to support diagnostic guidelines.

OPTIONS: Plain x-rays of the cervical spine (anteroposterior, open-mouth odontoid, and lateral) and plain dynamic lateral x-rays performed in flexion and extension are recommended. Tomography (computed or plain) and/or magnetic resonance imaging of the craniocervical junction may be considered.

MANAGEMENT: There is insufficient evidence to support treatment standards.

GUIDELINES: There is insufficient evidence to support treatment guidelines.

OPTIONS: Patients with os odontoideum, either with or without C1--C2 instability, who have neither symptoms nor neurological signs may be managed with clinical and radiographic surveillance. Patients with os odontoideum, particularly with neurological symptoms and/or signs, and C1--C2 instability may be managed with posterior C1--C2 internal fixation and fusion. Postoperative halo immobilization as an adjunct to posterior internal fixation and fusion is recommended unless successful C1--C2 transarticular screw fixation and fusion can be accomplished. Occipitocervical fusion with or without C1 laminectomy may be considered in patients with os odontoideum who have irreducible cervicomedullary compression and/or evidence of associated occipitoatlantal instability. Transoral decompression may be considered in patients with os odontoideum who have irreducible ventral cervicomedullary compression.

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