Figure 1 3D-CT angiography image shows severe luminal stenosis in the proximal parts of right subclavian artery (red arrow) and left subclavian artery (orange arrow) with long segment luminal narrowing of left common carotid artery (green arrow). Right common carotid artery (blue arrow) is not opacified (suggestive of luminal occlusion), except for a small proximal segment. 3D-CT = three-dimensional computed tomography