Chiari 1 malformation with atlanto-occipital assimilation and basilar invagination

Case contributed by Dr Aneta Kecler-Pietrzyk


Admitted with history of fall, head trauma and severe headache since.

Patient Data

Age: 30 years
Gender: Male

No acute intracranial abnormality.

Incidental note of low lying cerebellar tonsils suspicious for Chiari 1 malformation.

There is also complete atlantooccipital fusion noted associated with basilar invagination ( see annotated image with C2 dens seen above McRae line). Both skeletal abnormalities are associated with Chiari 1 malformation.  

McRae line with tip of dens extending above in keeping with basilar invagination. 

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Case information

rID: 65282
Published: 6th Jul 2019
Last edited: 14th Aug 2019
Inclusion in quiz mode: Included

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