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Pulmonary interstitial emphysema. a A supine radiograph of a 6-day-old girl with an extremely low birth weight shows generalized irregular radiolucent mottling and perivascular air (black arrow) in the left lung. b An axial chest CT image of a different patient (a 20-month-old girl with pneumonia) shows a subpleural cyst (asterisk), air within the interlobular septa (arrowheads), perivascular and peribronchial emphysema (white arrows), and pneumothorax
