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Accessory ossicle of the anterior arch of the atlas

Case contributed by: Dr Matt Skalski

Presentation:

Incidental finding

The abnormality depicted is well corticated and appears to articulate with the inferior aspect of the anterior arch of the atlas.

Modality: Diagram

Accessory ossicle of the anterior arch of the atlas.

Case Discussion:

Features compatible with accessory ossicle of the anterior arch of the atlas. This is a rare normal variant and should be DDXed with calcific tendinitis of the longus colli muscles. 

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