“…Computed tomography scans may not visualize the exact dimensions of the opening of the unroofed coronary sinus but additional abnormalities (i.e., persistent left superior vena cava or partial pulmonary venous return abnormality) can be delineated in detail [3]. Classically, patients with large unroofed coronary sinus are surgically corrected although a transcatheter therapeutic approach to the coronary sinus could be feasible [3][4][5]. Our Heart Team decided on the surgical correction due to the local expertise on congenital heart disease.…”