Please help with these questions Arterial Dissection (tear): may be spontaneous, related to vasculitis or trauma: True or False Stenosis (narrowing) due to atherosclerosis may be seen at branch points (bifurcation), in areas of turbulence: True or False Vasculitis may result in diffuse, focal or distal stenosis: True or False Is swallowing artifact as common on contrast enhanced MA as is is on TOF MRA, and if not, why? .