| A ‘transudate/exudate’ group that affects the dependent parts of the lung | A ‘granulomatous’ group that tends to spare the bases |
|---|---|
| Organising diffuse alveolar damage | Sarcoidosis |
| Idiopathic pulmonary fibrosis (usual interstitial pneumonia) | Extrinsic allergic alveolitis Langerhans cell histiocytosis |
| Chronic oedema | Silicosis |
| Asbestosis | Chronic berylliosis |
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