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Fig. 1. 76-year-old man with giant bullous emphysema. Chest CT scan shows
small drainage catheter entering anterior right chest wall. Catheter coursed
through several upper lobe bullae creating iatrogenic bronchopleural fistula
that required right upper lobectomy. Note small adjacent pneumothorax and
double-wall sign of air on both sides of bulla walls, parallel to chest wall
(arrow).