Ascending aorta aneurysmal disease is common and can be complicated by dissection or rupture. There is substantial variation in individual aneurysm progression: established risk factors for an accelerated aneurysm growth rate include initial size or localization, the presence of aortic valve disease, congenital bicuspid aortic valve or connective tissue disorders.

Although there is an increased lifetime risk when the aortic diameter exceeds 6 cm, predicting aneurysm progression is nearly impossible and dissection and rupture also occur at diameters under 6 cm. The assessment of aortic hemodynamics and the presence of altered flow patterns, as well as distribution and changes in wall shear stress (WSS) and the oscillatory shear index (OSI), using 4D phase contrast cardiovascular magnetic resonance (CMR) may provide further insights in how aneurysms develop and in assessing the risk of dissection. The purpose of this study was to investigate in patients with dilated ascending aorta the flow patterns and vessel wall parameters in order to correlate these hemodynamics factors with changes in aorta size.

Inclusion Criteria:

• Age ≥ 18 years.
• 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.
• Informed consent for participation in the study

Exclusion Criteria:

• Contraindication to MRI
• Patient's refusal to participate in the study and / or inability to express agreement or signing the informed consent.