Fig. 4

Photographs showing tracheal and bronchus stenosis in Case 2. a Photographs showing the middle and lower tracheal stenosis, and right main bronchus stenosis with caseous necrotic material attached to the nozzle exit before the treatment; b Photographs showing the narrowed trachea and right main bronchus immediately after the first treatment; c Photographs showing the middle and lower tracheal, and right main bronchus after the fifth treatment