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Fig. 4A. —72-year-old male trauma patient who underwent contrast-enhanced axial CT to assess thoracic involvement (single detector, 5-mm collimation) with mediastinal window settings (level, 400 H; width, 40 H). Ao = aorta, AAo = ascending aorta, DAo = descending aorta, PA = pulmonary artery. Tubular structure, which is patent ductus arteriosus (PDA) (asterisk), is seen below aortic arch. Bilateral pleural effusions and atelectasis are also seen.