“ Occurs where the tip of the dens protrudes above the basion-opisthion line (the opening of the foramen magnum, also known as the McRae lin...
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Occurs where the tip of the dens protrudes above the basion-opisthion line (the opening of the foramen magnum, also known as the McRae line).
Commonly associated with
rheumatoid arthritis (RA; 10% affected) and platybasia (flattening of the skull base, cranial basal angle >136°),
as well as rickets, osteomalacia, osteogenesis imperfecta,
Paget disease, fibrous dysplasia,
Klippel-Feil syndrome and hyperparathyroidism.
CT
• Sagittal reformat shows tip of the dens <5 mm below the basion-opisthion line.
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