Figure 7. Ventricular septal defect at ECG-gated CT performed in a 20-year-old man to monitor atrial and ventricular dimensions and function after a Fontan procedure for tetralogy of Fallot in early childhood. Thin-section reformatted image along the short axis of the heart shows a small ventricular septal defect (arrow) that leads to a communication between the left ventricle (LV) and the hypoplastic right ventricle (RV). RA = right atrium, RCA = right coronary artery.