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Fig. 5C. —52-year-old man with idiopathic tracheobronchomalacia and persistent cough after undergoing stenting of mainstem bronchi. Axial CT scan obtained during dynamic expiration shows focal collapse of proximal right upper lobe bronchus (straight arrow). Note hyperlucency of right upper lobe, consistent with air-trapping of affected lung (curved arrows). Arrowheads = bronchial stents.