A 27 year old woman was brought with paraparesis after slip and fall leading to trauma to the head.
CT scan of the neck shows block vertebrae at C2 and C3 with fusion of the anterior and posterior elements.their posterior elements. The dens is dysplastic with a well corticated ossicle superior to it and posterior to the anterior arch of the atlas - the os odontoideum. The anterior and posterior arches of the atlas are unfused. There is a slight increase in the atlanto-axial interval. Block vertebrae are also seen at C4, C5 and C6.