Fig. 3

Video bronchoscope. A-H: Multiple nodular elevations in the trachea, carina of trachea, left main bronchus, and right main bronchus were seen microscopically (A-B: trachea; C: carina of trachea; D-E: left main bronchus; F: left main bronchus on narrow-band imaging endoscopy; G: right main bronchus; H: right intermediate lung segment). Bronchus