<qa>  What is the aim of the study?The aim of the study is to select homogeneous small groups of surgical patients with the same subtype of BAV and same aortic behaviour and identify markerspredictors of favorable-unfavorable aortic wall evolution to evaluate if there is a BAV phenotype more likely to be considered at high risk for aortic degeneration. The study will focus on multiple aspects of BAV disease. What follows will be considered and combined: 