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Fig. 2C. —35-year-old man with giant bullous emphysema and left pneumothorax. Chest CT scan through mid thorax shows pneumothorax surrounding very large bulla, not evident in A. This emphasizes importance of visualization of air external to bulla (double-wall sign) and of not confusing air within adjacent large bulla as seen in Figure 5A,5B. Bulla wall is seen parallel to parietal pleura.