Editor—We read with interest the paper by Doull et alregarding tracheobronchomalacia in preterm infants with chronic lung disease.1 We have also recently investigated several infants with severe chronic lung disease who have become ventilator dependent. As part of our investigation, we assessed the large airways for evidence of tracheobronchomalacia using a flexible bronchoscope (Olympus BFN20 2.2 mm). We detected clinically significant airway collapse in a proportion of these …