From Double-Chambered Right Ventricle to Double-Chambered Left Ventricle: Unusual Evolution of a Ventricular Septal Defect

We present the first imaging registry of the progressive isolation of an apical chamber of the right ventricle caused by the hypertrophy of the moderator band generated from the hemodynamic effect of a ventricular septal defect, leaving the apex of the right ventricle as an accessory chamber of the left ventricle. (Level of Difficulty: Advanced.).