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Figure 2: (a and b) M3: On sagittal image, the axial plane corresponding to the superior margin of the posterior arch of atlas was determined. M3 was calculated in this axial plane by measuring the distance between the most medial point of the vertebral artery at the superior margin of the posterior arch of C1 (inner cortex) and the midline on either side. In patients with an occipitalized atlas, this corresponded to the axial plane subtended at the level of the junction between the fused occiput and atlas

Figure 2: (a and b) M3: On sagittal image, the axial plane corresponding to the superior margin of the posterior arch of atlas was determined. M3 was calculated in this axial plane by measuring the distance between the most medial point of the vertebral artery at the superior margin of the posterior arch of C1 (inner cortex) and the midline on either side. In patients with an occipitalized atlas, this corresponded to the axial plane subtended at the level of the junction between the fused occiput and atlas