The goal of this observational study is to compare two pre-operative methods, that is the Invasive Coronary Angiography (ICA), an actual standard diagnostic method, with the Coronary Computer Tomography (CCT) to undestand if the only CCT is sufficent to confirm the presence of a significative coronary disease and so to identify possible lesions in the coronary ematic circle, for example: stenosis and narrowing of coronary vessels. This observational study included people who have a congenital heart desease with indication of cardiac surgery and, why this disease, who had already performed these two diagnostic methods and/or who will perform them. The main question it aims to answer is: Should we avoid performing invasive coronary angiography (ICA) before cardiac surgery in people who have congenital heart desease (ACHD patients)?