PMC7581388_01
Show tracheal narrowing in expiration (A) and trachea in inspiration (B) with dynamic CT views taken just above the carina.
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A dynamic CT scan of the trachea and carina confirmed expiratory airway collapse that was more marked on the left (see Fig. 1) and consistent with tracheobronchomalacia. The normal trachea is slightly oval in shape with an AP diameter that is greater than its transverse diameter and resists deformation during a normal and a forced respiratory cycle (Fig. 1).
PMC7581388_02