Figure 1. Angiograms and illustrations of straightening of vessels by stent placement in Case 1.

(A) An angiogram shows a sidewall aneurysm at the left vertebral artery. (B) Six months after stent-assisted coil embolization for the aneurysm, an angiogram shows complete occlusion of the aneurysm and straightening of the vessel. (C) Two 3D images of the vessel and the aneurysm at pre- (in red) and post-treatment (in blue) are fused. (D) The “inflow angle” and “outflow angle” are defined as angles between the neck plane of an aneurysm and an inflow line or an outflow line, respectively. The angles can be negative when the angles show opposite directions.