Figure 1From: Carotid Wallstent placement difficulties encountered in carotid artery stenting Tortuosity and inflection point. A. The inflection point is defined as the center of lesion curvature. B. Tortuosity is defined as the angle (θ) formed by 2 tangential lines drawn on the internal carotid artery side and the common carotid artery side starting from the inflection point.Back to article page