Bronchiolitis obliterans. Unilateral fibrous obliteration of the lumen of bronchi with atelectasis.

We describe a child with collapse of the left lung. Results of pulmonary function studies showed FVC: 1.66 and FEV1: 1.53, both of which were 50 percent of normal. V-Q scan showed markedly reduced ventilation to the left lung. She underwent left pneumonectomy. Fibrous obliteration of cartilage-containing airways was seen throughout both lobes of the left lung.