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Figure 2: The first row shows 3D computed tomographic (CT) angiogram images of a patient with CAAD with right anomalous VA. Note the course of right VA beneath the C1 arch crossing the C1-2 joint. The second row shows severe AAD (both anteroposterior and vertical dislocation). The C1-2 joints are oblique. The third row shows postoperative CT images with correction of AAD in all planes and drilled (remodeled) C1-2 joint with C1-2 facet screws and spacers

Figure 2: The first row shows 3D computed tomographic (CT) angiogram images of a patient with CAAD with right anomalous VA. Note the course of right VA beneath the C1 arch crossing the C1-2 joint. The second row shows severe AAD (both anteroposterior and vertical dislocation). The C1-2 joints are oblique. The third row shows postoperative CT images with correction of AAD in all planes and drilled (remodeled) C1-2 joint with C1-2 facet screws and spacers