McRae Line on Radiographic Image
Summary:
- The McRae line is a line drawn on a lateral radiograph of the skull or on a sagittal cut from a CT or MRI scan that connects the posterior (opisthion) and anterior (basion) aspects of the foramen magnum
- The tip of the dens (or odontoid process) should be ~5 mm below this line. If it is above this line it is concerning for a possible basilar invagination.
McRae Line
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Radiographic Image
Note: If the tip of the dens is eroded then the
Redlund-Johnell and modified Ranawat methods (normal CT values for men is >
23.7 mm and for women is > 24.2 mm)
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Chamberlain Line Wackenheim Line Lateral X-Ray Odontoid View
