mri ct rheumatoid arthritis basilar invagination mcraes line wtd radedasia
mri ct rheumatoid arthritis basilar invagination mcraes line wtd radedasiamri ct rheumatoid arthritis basilar invagination mcraes line dx radedasia
Tip of the odontoid process (Pink arrow) lies above just above McRae’s line (Orange dashed line).

BASILAR INVAGINATION.

Apparent superior migration of the dens to the foramen magnum. Its apparent because its due to cranial settling with the skull base moving down rather than the odontoid moving up.

 

There are a number of lines that can be used to assess this but McRae’s line is relatively easy to perform.

 

McRae’s line is a line drawn from the anterior to the posterior margin of the foramen magnum on the lateral xray or in the mid sagittal plane on CT or MRI. Abnormal if the tip of the odontoid extends above this line.

We look at all of these topics in more detail in our SPINE & SIJ ARTHROPATHIES
MRI Mini Fellowships.


Click on the image below for more information.

 

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