Figure 3 which subsequently drains to the LBCV and to SVC. The axial image through the cardiac chambers show a large ASD between the RA and LA facilitating a right to left shunt and making the condition compatible with life. ASD, atrial septal defect; LBCV, left brachiocephalic vein; LA, light atrium; RA, rightatrium; SVC, superior vena cava.