,
odontoid abnormalities, odontoid absence, and ball and socket occiput-atlanto
joint with 
or
without instability.
The correct answer is:
The cervical spine is commonly involved. Often there are multiple vertebral
fusions, C2 - C3 fusion,
odontoid abnormalities, odontoid absence, and ball and socket occiput-atlanto
joint with or
without instability.
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