Table 1 Interstitial lung disorders: major categories
• Idiopathic interstitial pneumonia | • Sarcoidosis |
 o Idiopathic pulmonary   fibrosis (IPF) | • Hypersensitivity pneumonitis |
 o Non-specific interstitial   pneumonia (NSIP) | • Iatrogenic pneumonitis/fibrosis (drug-induced ILD, radiation injury) |
 o Cryptogenic organizing   pneumonia (COP) | • Eosinophilic ILD (e.g. eosinophilic pneumonia) |
 o Respiratory bronchiolitis   interstitial lung disease (RBILD) | • Occupational lung disease |
 o Desquamative interstitial   pneumonia (DIP) | • Inherited disorders (e.g. familial pulmonary fibrosis, Hermansky-Pudlak syndrome) |
 o Acute interstitial   pneumonia (AIP) | • Primary disorders (e.g. pulmonary Langerhans cell histiocytosis) |
 o Lymphoid interstitial   pneumonia (LIP) |  |
• Connective tissue disease-associated interstitial lung disease (CTD-ILD) |  |