Magnetic resonance imaging in case 4. Magnetic resonance imaging (sagittal view) in case 4 showing the morphology of the patient’s congenital heart disease. We found no persistent left superior vena cava or other congenital cardiovascular anomalies. The arrow indicates the coronary sinus defect. Ao aorta, CS coronary sinus, LA left atrium, PA pulmonary artery, RA right atrium