Fig. 1. Sagittal (A), coronal (B), axial (C, D) computed tomography scans showing the presence of atlas assimilation (red arrowheads), anterior atlas arch defect (green arrowhead) and posterior arch defect (blue arrowhead). Sagittal image (E) shows the distance between the odontoid apex and Chamberlain’s line, lining between the hard palate and the opisthion (7.5 mm), suggesting basilar invagination into the posterior cranial cavity of skull. The angle between clivus and posterior aspect of odontoid process was 138.8°, indicating predisposition to anterior spinal cord compression.
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