Bilateral atlanto-occipital assimilation

Case contributed by Dr Henry Knipe


Alleged assault

Patient Data

Age: 55
Gender: Female

Cervical spine

Modality: CT

Bilateral atlanto-occipital assimilation. Congenital C2/3 fusion. Well-corticated calcification at anterior C4/5 disc space appear chronic and are degenerative in nature. No acute cervical spine fracture or malalignment demonstrated. Prevertebral soft tissues are within normal limits. Mild multilevel degenerative change with posterior disc bulges at C3/4, C4/5 and C5/6 indenting the thecal sac.

Case Discussion

This case demonstrates partial atlanto-occipital assimilation, with the posterior arch of C1 not fully fused and still identifiable. Atlanto-occipital assimilation is often asymptomatic (as in this case) and represents a transitional vertebrae. There is also congenital C2/3 fusion, which is often associated. 

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Case Information

rID: 28350
Case created: 22nd Mar 2014
Last edited: 30th Aug 2015
Inclusion in quiz mode: Included

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