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Bicuspid aortic valves (BAV) affect around 1-2% of the normal population and can be classified due to their number of raphes.Around half of patients with BAV develop a dilatation of the ascending aorta, which itself can vary in form and extension.There is an ongoing dabate with regard to genetic and/or hemodynamic causes of the aortic dilatation.So far, it is not clear whether regurgitant BAV are associated in the same way with aortic dilatation as stenotic BAV.As patients with BAV are not only at risk due to their valve pa thology but also because of the potentional risk of aortic rupture or dissection.It is thereforeof major clinical relevance to adequately control these patients.Understanding the correlation of various types of BAV and aortic dilatation will have important implications on prognostic, therapeutical and surgical aspects.