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Figure 1: Sagittal section noncontrast computed tomography of the base of skull showing dens is more than 2.5 cm above the Chamberlain line (posterior hard palate to opisthion) indicating presence of basilar invagination (A); and atlantoaxial interval more than 10 mm (normal: 5 mm in children) suggestive of atlantoaxial dislocation (B)

Figure 1: Sagittal section noncontrast computed tomography of the base of skull showing dens is more than 2.5 cm above the Chamberlain line (posterior hard palate to opisthion) indicating presence of basilar invagination (A); and atlantoaxial interval more than 10 mm (normal: 5 mm in children) suggestive of atlantoaxial dislocation (B)