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The radiographic assessment of basilar invagination can be assessed by observing relative position of tip of odontoid process on frontal and lateral view of skull on x ray as well as on the coronal and sagittal planes on CT.
- Digastric line (yellow line) - tip of odontoid process is normally located 11 mm below this line.
- Bimastoid line (blue line) - tip of odontoid process projects normally not more than 10 mm above this line.