 2. Proximal non-aneurysmal aortic neck length must be 20 mm for FreeFlo configuration and 25 mm for Closed Web configuration distal to the left common carotid artery LCCA. Note: Proximal aortic neck length may include covering the LSA with or without discretionary revascularization when necessary to optimize device fixation and maximize aortic neck length. If occlusion of the LSA ostium is required to obtain adequate neck length for fixation and sealing, transposition or bypass to the LSA may be warranted. 