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  Indian J Med Microbiol
 

Figure 1: Preoperative images. ( a) T2-weighted magnetic resonance imaging showing basilar invagination. Chiari formation and syringomyelia can be observed. (b) Computed tomography scan showing basilar invagination. Assimilation of the atlas can be seen. (c) Computed tomography scan with the cut passing through the left C1–2 articulation. The vertebral artery foramen is high riding. The facet of C1 is markedly anterior and rostrally located, making direct exposure for screw implantation difficult. (d) Computed tomography scan with the cut passing through the right facetal articulation. The articular surfaces of the facets of atlas and axis are positioned vertically. (e) Three-dimensional model of the craniovertebral junction shows the relationship of the lateral masses with the vertebral artery. The sizes of the pedicles can be appreciated clearly

Figure 1: Preoperative images. ( a) T2-weighted magnetic resonance imaging showing basilar invagination. Chiari formation and syringomyelia can be observed. (b) Computed tomography scan showing basilar invagination. Assimilation of the atlas can be seen. (c) Computed tomography scan with the cut passing through the left C1–2 articulation. The vertebral artery foramen is high riding. The facet of C1 is markedly anterior and rostrally located, making direct exposure for screw implantation difficult. (d) Computed tomography scan with the cut passing through the right facetal articulation. The articular surfaces of the facets of atlas and axis are positioned vertically. (e) Three-dimensional model of the craniovertebral junction shows the relationship of the lateral masses with the vertebral artery. The sizes of the pedicles can be appreciated clearly