 Aortic wall stiffness is a fundamental biomechanical parameter that reflects the structural integrity of normal and aneurysmal aortic tissue. AAAs enlarge over time leading to sudden rupture and death in up to 90 of patients. Surgical or endovascular aneurysm repair EVAR is recommended for AAAs 5.5 cm in diameter. However, previous studies have reported a high percentage 13 of smaller AAAs 5 cm go on to rupture, and an even higher percentage 60 of larger AAAs 5 cm remain stable. Despite the poor prognostic value of aortic diameter, it is still the primary parameter used to time surgical repair. It is known that changes in stiffness of AAA can reveal important information on extra-cellular matrix content; a key factor in the pathophysiological development of AAA and the risk for rupture. A non-invasive, spatially resolved estimate of aortic stiffness may provide a superior determinant of the risk for rupture compared to the currently used anatomical measures. The relationship between non-invasively measured wall stiffness WS and the structural integrity of the aortic wall must be further elucidated. Therefore, aortic MRE can be used as a noninvasive tool to estimate the stiffness of AAAs and can provide superior diagnostic and prognostic information in patients with developing AAA disease. 