FIG 1.

Measurement of parent artery straightening. Angles were measured at the intersection of 2 lines drawn from the neck center in the axis of the proximal and distal segments of the parent artery. $\mathrm{\alpha }$ is the angle measured before stent placement, and $\mathrm{\beta }$ is the angle measured after stent deployment. Preoperative (1) and postoperative (2) drawings.