Chiari 1 malformation with atlanto-occipital assimilation and basilar invagination
Diagnosis almost certain
Presentation
Admitted with history of fall, head trauma and severe headache since.
Patient Data
Age: 30 years
Gender: Male
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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.
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McRae line with tip of dens extending above in keeping with basilar invagination.
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