Original pathological diagnoses of the cases in the study
| Patient no. | Original diagnosis |
| 1 | Obliterative bronchiolitis |
| 2 | Mild chronic bronchiolitis |
| 3 | Obliterative destructive bronchiolitis consistent with rheumatoid arthritis |
| 4 | Mild chronic bronchiolitis |
| 5 | Mild chronic bronchiolitis, pulmonary vascular remodelling with intimal thickening, normal lung parenchyma |
| 6 | Multifocal interstitial fibrosis consistent with bronchiolitis obliterans. Giant cells and cholesterol clefts can be the result of a hypersensitivity pneumonitis. |
| 7 | Mild chronic bronchiolitis with centrilobular emphysema |
| 8 | Chronic bronchiolitis, intraalveolar haemorrhage |
| 9 | Patchy nonspecific lymphocytic pneumonitis with lymphocytic bronchiolitis. Poorly formed granulomas. Differential diagnosis includes hypersensitivity pneumonitis, post-viral infection, collagen vascular disease. |
| 10 | Concentric, partially obliterative, active bronchiolitis |
| 11 | Constrictive bronchiolitis with focal bronchiolar fibrous obliteration, lymphocytic infiltrate and peripheral emphysema |
| 12 | Chronic obliterating bronchiolitis |
| 13 | Bronchiolitis obliterans with mucoid impaction. Many neutrophils inside the mucus plugs. Multifocal ulceration of bronchial epithelium, with formation of granulation tissue polyps within the lumens of muscular bronchioles. Consistent with previous viral infection. |
| 14 | Destructive obliterative bronchiolitis with focal areas of mucus plugging |
| 15 | Mild chronic bronchiolitis with smooth muscle hypertrophy and irregular fibrosis with luminal distortion of respiratory and terminal bronchioles. |
| 16 | Obliterative bronchiolitis |
| 17 | Chronic bronchiolitis of the constrictive type (sometimes called small airways disease) |
| 18 | Proliferative obstructive bronchiolitis, pulmonary haemosiderosis |
| 19 | Mild chronic bronchiolitis |