Figure 22: A - Left lateral view of the great arteries after an arterial switch operation. The main pulmonary artery (MPA) is anterior to the aorta (Ao). The left pulmonary artery (LPA) has been divided to show the inside of the aorta. The suture line (blue sutures) is evident between the ascending aorta (Ao) and the pulmonary root (*). The right coronary artery ostium (RCA) with surrounding button of aortic wall is seen on the right side of the aorta. B - A frontal view of the same heart showing the MPA and branches. The right pulmonary artery (RPA) passes posteriorly between the Ao and the superior vena cava (SVC). The divided LPA is to the left of the aorta (Ao).