Preliminary echocardiographic data of TAA patients treated with TEVAR at the University of Michigan Health System revealed an average LV mass increase of 39% (P = 0.047) at 1-year follow-up. Power analysis for a Mann-Whitney U test, based on these preliminary data, calculated that for a significant threshold of 5% (P < 0.05, two-sided test) a total sample size of 20 patients (α = 0.05, power = 97%) would be needed to observe a significant effect of TEVAR on LV mass increase. To ensure a margin of error, the investigators aim to include 12 TEVAR patients and 12 control patients.