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Projection of the tip of the dens more than 5 mm above a line joining the hard palate to the posterior lip of the foramen magnum (Chamberlain\'s line) or the tip of the dens is greater than 7 mm above McGregor\'s line (the back of the hard palate to the lowest point of the occipital squama). [HPO:probinson, PMID:10084535]
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