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Figure 3: Images of a 15-year old female. (A) Preoperative MRI showing basilar invagination and fixed atlantoaxial dislocation. (B) Preoperative CT scan showing relatively minor basilar invagination and fixed atlantoaxial dislocation. (C) Postoperative CT scan showing incomplete but significant reduction of basilar invagination and atlantoaxial dislocation. (D) Sagittal image through the atlantoaxial joint showing the spacer. (E) Sagittal image through the joint showing the distraction and opening up of the joint. (F) Coronal image of CT scan showing the spacers in both the atlantoaxial joints. (G) Postoperative X-ray showing the spaces in the joints

Figure 3: Images of a 15-year old female. (A) Preoperative MRI showing basilar invagination and fixed atlantoaxial dislocation. (B) Preoperative CT scan showing relatively minor basilar invagination and fixed atlantoaxial dislocation. (C) Postoperative CT scan showing incomplete but significant reduction of basilar invagination and atlantoaxial dislocation. (D) Sagittal image through the atlantoaxial joint showing the spacer. (E) Sagittal image through the joint showing the distraction and opening up of the joint. (F) Coronal image of CT scan showing the spacers in both the atlantoaxial joints. (G) Postoperative X-ray showing the spaces in the joints