<unk><unk>  is a part of<unk>  syndrome which is consist of four classes depending on nature of aspirated substance including foreign body<unk> , chemical<unk> is, bacterial infection, and lipid<unk> .<unk><unk> , depending on the duration of systems might be classified into two groups of acute and chronic.
Aspiration pneumonia classification
Pneumothorax classification
Acute respiratory distress syndrome classification
Pulmonary embolism classification
Pneumonia diagnostic criteria
Pleural empyema classification
Hemothorax classification
Pleural effusion classification