MRI done 3 days following head injury.
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Incidental detection of basilar invagination.
Tip of the odontoid is 5mm above the level of Foramen magnum (MacRae's Line). The pro-atlas is seen to articulate with inferior margin of clivus with large osteophytes at this neo-articulation.
The transverse ligament is thickened and is indenting the brainstem. No abnormal signal intensity in the brainstem.
Patient incidentally had "Kissing carotids"
Final diagnosis: Basilar invagination