CTICasesExcessive dynamic airway collapse
Imaging findings
Inspiration and standard end-expiratory CT scans show normal tracheal and bronchial caliber and morphology, but a dynamic forced-expiratory CT demonstrates marked collapse of the trachea, bronchus intermedius, and mainstem bronchi due to excessive anterior invagination of the posterior membranous trachea.
Key takeaways
Excessive dynamic airway collapse (EDAC) is characterized by pathologic narrowing of the airway lumen during forced expiration, primarily due to laxity of the posterior membranous wall. Unlike tracheobronchomalacia (which involves cartilaginous weakness), the cartilage in EDAC is normal.
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