Odontoid (peg) fracture
Road traffic accident, neck pain, no neurological deficits.
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Oblique linear fracture noted in the odontoid process and lower part of the anterior tubercle of C2.
This is an Anderson and D'Alonzo type II odontoid fracture, an unstable injury. It has the highest rates of non-union. Differential diagnosis includes Bergmann's ossicle.