Basilar invagination

Case contributed by Dr Henry Knipe



Patient Data

Age: 70 years
Gender: Female

No intra- or extra-axial collection or hemorrhage demonstrated. No focal abnormality. Grey-white differentiation is preserved. Ventricular size, sulcal pattern and basal cisterns all appear normal. Basilar invagination is present with narrowing of the craniocervical junction and mildly impresses on the medulla oblongata/cervical spinal cord, unchanged from prior. The dens is mildly expanded and sclerotic/irregular with well-circumscribed lobulated lucency/erosion at the posterior aspect of the base of the dens.

Case Discussion

Basilar invagination was an incidental finding in this case. It has a wide range of acquired and congenital causes. In this case the patient has a history of rheumatoid arthritis, which is the most common acquired cause and this patient's most likely cause. 

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Case information

rID: 29436
Published: 24th May 2014
Last edited: 14th Aug 2019
Tag: spine
Inclusion in quiz mode: Included

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