Spirometry with FVL measurement is a vital component of the patient evaluation for respiratory symptoms, and when a properly performed FVL test is abnormal it should prompt a thorough investigation.

Tracheobronchomalacia (TBM) is a rare disease caused by weakness of the trachea and bronchi due to softening of the supporting cartilage and hypotonia of myoelastic elements. 1,2 We present two cases ...