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Figure 1: Images of a 23-year-old female patient. (a) Contrast-enhanced MRI shows dysplastic enhancing tissue in the craniovertebral junction. Atlantoaxial instability can be seen. (b) CT scan shows atlantoaxial disability. (c) CT scan cut traversing through the facets showing dislocation of facet of atlas anterior to facet of axis. The subaxial facets are of normal architecture. (d) Postoperative image showing significant but incomplete reduction of atlantoaxial dislocation. (e) Postoperative CT scan sagittal cut showing the instrumentation. (f) CT scan images showing the metal implant in the atlantoaxial and subaxial facets

Figure 1: Images of a 23-year-old female patient. (a) Contrast-enhanced MRI shows dysplastic enhancing tissue in the craniovertebral junction. Atlantoaxial instability can be seen. (b) CT scan shows atlantoaxial disability. (c) CT scan cut traversing through the facets showing dislocation of facet of atlas anterior to facet of axis. The subaxial facets are of normal architecture. (d) Postoperative image showing significant but incomplete reduction of atlantoaxial dislocation. (e) Postoperative CT scan sagittal cut showing the instrumentation. (f) CT scan images showing the metal implant in the atlantoaxial and subaxial facets