Accessory ossicle of anterior arch of C1 (atlas vertebra)
Road traffic accident, neck pain and stiffness, no neurological symptoms.
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A well corticted ossicle noted just inferior to the anterior tubercle of atlas vertebra. No prevertebral soft tissue thickening or any other traumatic injury to the cervical spine.
It is important to be aware of this normal variant as in the setting of trauma, one may think of fracture of the anterior tubercle/arch of atlas vertebra. However, the well corticated margins and the mild arthritic changes suggest this not being related to the RTA.