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Figure 1: Images of a 17-year-old male patient. (A) Preoperative CT scan shows basilar invagination. Assimilation of the atlas can be observed. (B) Preoperative CT scan showing the abnormal alignment of the atlantoaxial. (C) Coronal images of the CT scan showing the craniovertebral junction and the joints. (D) Axial section of the MRI showing marked rotation of the odontoid process. (E) Postoperative CT scan showing the reduction of basilar invagination and improvement in the craniovertebral alignments. (F) Postoperative sagittal cut through the atlantoaxial joint showing marked realignment of the facets and the joint. (G) Postoperative sagittal cut showing the spacer in the atlantoaxial joint and the realignment. (H) Postoperative coronal section showing the spacers in both the atlantoaxial joints. (I) Postoperative X-ray (lateral view) showing spacers in both the atlantoaxial joints. Evidence of bone fusion is noted

Figure 1: Images of a 17-year-old male patient. (A) Preoperative CT scan shows basilar invagination. Assimilation of the atlas can be observed. (B) Preoperative CT scan showing the abnormal alignment of the atlantoaxial. (C) Coronal images of the CT scan showing the craniovertebral junction and the joints. (D) Axial section of the MRI showing marked rotation of the odontoid process. (E) Postoperative CT scan showing the reduction of basilar invagination and improvement in the craniovertebral alignments. (F) Postoperative sagittal cut through the atlantoaxial joint showing marked realignment of the facets and the joint. (G) Postoperative sagittal cut showing the spacer in the atlantoaxial joint and the realignment. (H) Postoperative coronal section showing the spacers in both the atlantoaxial joints. (I) Postoperative X-ray (lateral view) showing spacers in both the atlantoaxial joints. Evidence of bone fusion is noted