Rare atlantoaxial dislocation secondary to os odontoideum: A comparative study of orthotopic and dystopic variants with two representative cases.

Atlantoaxial dislocation often results in upper cervical spinal cord compression, which may lead to significant neurological impairment. Among these, os odontoideum (OO) is a rare anomaly where the odontoid is replaced by a separate ossicle. Case one…

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