- Supra-coronary aortic diameter measured by CT-scan or transthoracic/trans-esophageal echocardiography between 40 and 45 mm in case of presence of aortic valve disease, bicuspid aortic valve or connective tissue disease and between 40 and 50 mm in case of absence of aortic valve disease, bicuspid aortic valve disease or connective tissue.