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Figure 1: (a) Midsagittal computed tomography showing atlantoaxial dislocation with assimilated atlas and C4–C6 fusion (arrow). (b) Coronal computed tomography showing central atlantoaxial dislocation with oblique C1–C2 angles. C3 butterfly is evident (arrow). (c) Parasagittal computed tomography showing oblique C1–C2 joint (arrow). (d) Posterior view of three-dimensional computed tomography showing absent posterior arch and bilateral anomalous vertebral arteries (arrows). (e) Lateral view of three-dimensional computed tomography showing absent C2 posterior arch, C3 posterior elements attached only to C4 but not to C3 body. (f) Axial image showing split body and separated posterior arch

Figure 1: (a) Midsagittal computed tomography showing atlantoaxial dislocation with assimilated atlas and C4–C6 fusion (arrow). (b) Coronal computed tomography showing central atlantoaxial dislocation with oblique C1–C2 angles. C3 butterfly is evident (arrow). (c) Parasagittal computed tomography showing oblique C1–C2 joint (arrow). (d) Posterior view of three-dimensional computed tomography showing absent posterior arch and bilateral anomalous vertebral arteries (arrows). (e) Lateral view of three-dimensional computed tomography showing absent C2 posterior arch, C3 posterior elements attached only to C4 but not to C3 body. (f) Axial image showing split body and separated posterior arch