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Fig. 2B. —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. Axial MDCT (aortic protocol) with mediastinal window settings (level, 400 H; width, 40 H) show thin tubular structure (asterisk) between ascending and descending aorta (A). This patent ductus arteriosus (PDA) has horizontal orientation, making it more obvious on axial images. Lower level (B) shows thin "positive jet" (arrow) of contrast media flowing from maximally enhanced aorta to less-opacified pulmonary artery.