AGT and triple-A syndrome: 2010; Trachet et al. 2015a), and the dissecting aneurysms vary in size and severity (Prins et al. 2014). Unlike surgical experimental models of AAAs, the AngII model can cause a dissecting AAA, aortic rupture, or no breakage of aortic elastin and a seemingly normal vessel (Trachet et al. 2015a). In this study, we used baseline measurements acquired with high‐frequency US for 94 male apoE−/− mice implanted with osmotic mini‐pumps filled with AngII.