Basilar invagination and platybasia
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Tip of the odontoid is above the level of the foramen magnum (basilar invagination) resulting in significant narrowing of the canal and compression over the cord at this level.
Abnormal flattening of the skull bases is seen (platybasia).
No significant obstruction (no hydrocephalus or syrinx formation) noted.
No tonsillar herniation to suggest Chiari malformation (group I).