Fig. 1
Preoperative imaging. a The cervical neural position showing expansion of the atlanto-dental interval. The upper atlantodental interval was 11.8 mm. b Computed tomography showing enlargement of the C2/3 foramen on the sagittal side of the left cervical spine. c Axial computed tomography image at the height of the C2 vertebra showing enlargement of the left side C2/3 foramen. d Computed tomographic angiography showing a left-side vertebral artery inside of the C1 lamina. e T2-weighted magnetic resonance imaging of the sagittal cervical spine showing spinal cord compression caused by a dislocated odontoid. f T2-weighted magnetic resonance cervical axial imaging showing disruption of the transverse ligament of the atlas and neurofibroma between the anterior arch of C1 and the odontoid