Abdominal aortic aneurysms (AAAs) represent the 10° leading cause of death and accounted for nearly 16,000 deaths overall from the year 2000, according to the National Vital Statistics Report on Deaths. AAAs are characterized by a focal dilation of the aorta often with the presence of an intraluminal thrombus (ILT) that is unsafe for rupture, it may occlude blood flow through the aneurysm, and bits of it may break off and generate emboli that could interrupt the flow of blood on smaller vessels. The hemodynamics of the blood flow has an impact on the vessel and on the enlargement of the ILT, so recently some indicators have been proposed based on the Wall Shear Stress (WSS), a vectorial quantity that represents the tangential stress that acts on the vessel wall.