PMC5161792_01
(Left) Axial non-contrast computed tomography (CT) during inspiration showing a normal tracheal lumen. During expiration, axial non-contrast CT (center) showing thin crescent tracheal lumen and (right) both main stem bronchi (arrows).
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A non-contrast dynamic expiratory chest CT revealed diffuse pulmonary emphysema, 11 mm right upper lobe pulmonary nodule and greater than 50% collapse in the distal trachea/multiple central bronchi and complete collapse of the bronchus intermedius, which is suggestive of tracheobronchomalacia (Fig. 1).