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Accessory ossicle of the anterior arch of the atlas

Case contributed by: Dr Matt Skalski
From the case: Accessory ossicle of the anterior arch of the atlas
Modality: X-ray

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

From the case: Accessory ossicle 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. 

Related article

References:

  1. Anderson MW, Keats TE. Atlas of Normal Roentgen Variants That May Simulate Disease, Expert Consult - Enhanced Online Features and Print. W B Saunders Company. (2012) ISBN:0323073557. Read it at Google Books - Find it at Amazon

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