Recent head trauma.
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Bilateral comminuted fracture of the anterior and posterior arches of C1 vertebra with mild displacement and free bone fragments. Mild lateral displacement of lateral atlas masses, seen on coronal view.
Undisplaced transverse fracture of the Dens (odontoid process) with the lateral masses of CV2. The fracture line is extending to lateral masses of CV2 with cortical interruptions (type III Dens fracture), best seen in coronal images. There is associated elevated periosteum and subperiosteal hyperdense collection (subperiosteal hematoma), best seen on sagittal images.
This is a post traumatic case that demonstrates Jefferson (C1) and odontoid (C2) fractures.