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Figure 2 Left, Postnatal two-dimensional echocardiogram in a newborn (case 13), which shows saccular dilation of the ductus arteriosus to the left of the main pulmonary artery. Right, Color Doppler shows left to right shunting through a constricted pulmonary end of the PDA. DAA = ductus arteriosus aneurysm; PA = main pulmonary artery; PDA = patent ductus arteriosus.