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Chamberlain's line

Chamberlain’s line is a line joining the back of hard palate with the posterior lip of the foramen magnum on a lateral view of the craniocervical junction.

Significance

It helps to recognize basilar invagination which is said to be present if the tip of the dens is > 3mm above this line.

McGregor developed a modification of  the Chamberlain line when the opisthion could not be identified on plain radiographs.

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