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a–d Pneumothorax. a Tension pneumothorax in a premature baby on the right side with a mediastinal shift to the left and compression of the left lung. b Anteroposterior and c lateral view of pneumomediastinum with air around the thymus—the “angel wing sign”—and bilateral basal pneumothorax in a term baby with respiratory problems. d A 7-year-old girl with pneumothorax on the right side and air leak into the mediastinum and subcutaneous tissue on the neck and axillae bilaterally
