HRCT of patient No.-glass pattern with air trapping and bronchial thickening.

<p>HRCT of patient No.-glass pattern with air trapping and bronchial thickening.</p

Pulmonary function results in infants and young children.

<p>Pulmonary function results in infants and young children.</p

Disease severity evaluation method.

<p>Patient's disease severity was defined as none (summed score  = 0), mild (summed score ranged from 1 to 3), moderate (summed score ranged from 4 to 7), and severe (summed score ranged from 8 to 12).</p

Clinical characteristics and imaging results of patients (n = 25).

<p>All patients had persistent cough and wheezing, so these manifestations were not listed in the symptoms column. All patients showed mosaic pattern and air trapping by HRCT, so these imaging findings were not listed in the HRCT column. BWT =  bronchial wall thickening; Be =  Bronchiectasis</p

Fiberoptic bronchoscopy of the same patient shown in Figure 1.

<p>Complete obstructions were observed in the subsegmental anterior basal bronchus of the left lower lobe (A) and in the subsegmental lateral bronchus of the right middle lobe (B).</p

Three patterns of V/Q scan (A. mismatched ventilation; B. mismatched perfusion; C. matched ventilation-perfusion) in post-infectious BO children (patient No. 4, patient No. 21 and patient No. 12), displayed in 8 views.

<p>POS =  posterior, RPO =  right posterior oblique, RL =  right lateral, RAO =  right anterior oblique, ANT =  anterior, LAO =  left anterior oblique, LL =  left lateral, LPO =  left posterior oblique.</p