Fig. 12.

Lateral radiographs of the skull in a young child with OI (left) and a young adult with OI (right) show an incipient deformation of the occipital region associated with numerous wormian bones (arrows) on the left and a basilar impression on the right, as revealed by significant axis migration above Chamberlain’s line (i.e., the dotted line joining the posterior aspect of the foramen magnum and the posterior aspect of the hard palate) on the right