Fig. 2. Images of a 32-year-old male. (A) T2-weighted magnetic resonance imaging shows group A basilar invagination. Chiari malformation is observed. Ill-defined cord changes are observed in the spinal cord at C3 spinal level. (B) Computed tomography (CT) scan showing basilar invagination. Assimilation of atlas and C2-3 fusion can be observed. (C) Sagittal image with the section passing through the facets. Facets of C1 and C2 are in severe mal-alignment. (D) Postoperative image following surgery that involved distraction, reduction and fixation of the atlantoaxial joint. Please note the reduction of basilar invagination. (E) CT scan image showing realignment of the facets.