| Reticular or linear opacities |
| Peripheral lung zone predominance |
| Bronchiolitis obliterans with organizing pneumonia |
| Eosinophilic pneumonia |
| Upper zone predominance |
| Granulomatous disease |
| Sarcoidosis |
| Pulmonary Langerhans cell histiocytosis |
| Chronic hypersensitivity pneumonitis |
| Chronic infectious diseases (eg, tuberculosis, histoplasmosis) |
| Pneumoconiosis |
| Silicosis |
| Berylliosis |
| Coal miners' pneumoconiosis |
| Hard metal disease |
| Miscellaneous |
| Rheumatoid arthritis (necrobiotic nodular form) |
| Ankylosing spondylitis |
| Radiation fibrosis |
| Drug-induced (amiodarone, gold) |
| Lower zone predominance |
| Idiopathic pulmonary fibrosis |
| Rheumatoid arthritis (associated with usual interstitial pneumonia) |
| Asbestosis |
