Unfused anterior and posterior arch of C1
Head injury patient came for a routine screening non contrast study of the brain.
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No intracranial hemorrhage. No bony calvarial or skull base fracture. Non fusion of anterior and posterior arch of atlas with margins appearing well corticated and showing degenerative changes. Wider gap seen in posterior midline more than anterior.
Congenital non fusion of the arches of atlas needs to be distinguished from fractures of the arch. This anatomical variant has to be kept in mind especially as they could get misread for fractures by non radiologists.