<unk>  pneumonia may be classified according to source of the<unk>  exposure into 2 subtypes: Exogenous, more common type reported, due to aspiration or inhalation of fatty substance, and endogenous, due to obstructive pneumonia.
Lipoid pneumonia classification
Eosinophilic pneumonia classification
Aspiration pneumonia classification
Pleural empyema classification
Hypersensitivity pneumonitis classification
Bronchiectasis classification
Lung abscess classification
Lung abscess epidemiology and demographics