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Fig. 2F. —49-year-old man evaluated for questionable aortic root dilatation seen on transthoracic echocardiography. Ao = aorta. AAo= ascending aorta, DAo = descending aorta, PA = pulmonary artery, LV = left ventricle. Cardiac MRI steady-state free precession (cardiac MR SSFP) images. In axial image (E), horizontally oriented PDA (asterisk) is seen as tubular structure coursing between ascending and descending aorta. Axial image (F) and coronal image (G) cardiac MR SSFP show blood flow via the PDA (asterisk) from the aorta to the pulmonary artery causing dephasing (arrow) within pulmonary artery.