Figure 9. Atrioventricular septal defect. Axial ECG-gated spin-echo image shows an atrial septal defect (arrow) in the septum primum. The atrioventricular valve (arrowhead) is connected with the crest of the inlet ventricular septum. LA = left atrium, LV = left ventricle, RA = right atrium, RV = right ventricle.