The goal of this observational study is to learn about the long-term effects of aortic valve annular calcification in patients undergoing transcatheter aortic valve replacement (TAVR). The main question it aims to answer is: Does the degree of aortic valve annular calcification prior to TAVR influence long-term clinical outcomes, including major adverse cardiovascular events including all-cause mortality, over a 3-year period? Participants who have undergone TAVR as part of their regular medical care for severe aortic stenosis will have their pre-procedural imaging and clinical outcomes evaluated for a 3-year follow-up period.