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Chamberlain line

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

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

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