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Fig. 1C. —65-year-old woman with scleroderma, severe pulmonary artery hypertension, and cardiac murmur. Ao = aorta. AAo = ascending aorta, DAo = descending aorta, PA = pulmonary artery. With optimized window settings (level 400 H; width, 280 H), tubular structure (asterisk) can be seen abutting aorta. Unenhanced blood can be seen flowing from aorta to pulmonary artery via patent ductus arteriosus (PDA) (white arrow). Adjacent coarse calcifications are marked with black arrow.