Figure 1: (a) Subcostal short axis view during transthoracic echocardiogram showing an ostium secundum atrial septal defect (asterisk) with superior margin which is also known as superior vena cava margin (white arrow) and inferior margin (Inferior vena cava margin, red arrow).(b) Apical four chamber view showing anterior inferior or atrioventricular valve margin (green arrow) and postero-superior margin (yellow arrow).(c) Parasternal short axis view showing the deficient aortic margin (orange notched arrow) and posterior margin (light green arrow)