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Figure 1: Pre-operative midsagittal T1 (a) and T2 weighted (b) MRI showing significant compression at the cranio-cervical junction; mid sagittal CT scan image (c) showing the fused C1 anterior arch to the occiput; right (d); left (e) parasagittal; and, coronal (f) images showing an abnormally vertical right C1-C2 facet joint, while the left side joint is horizontal

Figure 1: Pre-operative midsagittal T1 (a) and T2 weighted (b) MRI showing significant compression at the cranio-cervical junction; mid sagittal CT scan image (c) showing the fused C1 anterior arch to the occiput; right (d); left (e) parasagittal; and, coronal (f) images showing an abnormally vertical right C1-C2 facet joint, while the left side joint is horizontal