Table 1. Classification of bronchiolar disorders Adapted from [1].

- Acute bronchiolitis

- Constrictive bronchiolitis

- Respiratory bronchiolitis

- Diffuse panbronchiolitis

- Follicular bronchiolitis

- Mineral dust airway disease

- Interstitial lung diseases with bronchiolar involvement (RB-ILD/DIP, HP, COP, pulmonary Langerhans' cell histiocytosis, sarcoidosis, bronchiolocentric interstitial pneumonia)

- Large airway diseases with bronchiolar involvement (chronic bronchitis, bronchiectasis, asthma)

- Other bronchiolar disorders (e.g., diffuse aspiration bronchiolitis, lymphocytic bronchiolitis)

RB-ILD/DIP, respiratory bronchiolitis–associated interstitial lung disease/desquamative interstitial pneumonia; HP, hypersensitivity pneumonitis; COP, cryptogenic organizing pneumonia