DDx ⬇
- Empyema
- Pneumonia with parapneumonic effusion
- Cancer
- Pulmonary embolism
- Tuberculosis
- Connective tissue disease (eg, rheumatoid arthritis)
- Viral infection
- Fungal infection
- Rickettsial infection
- Parasitic infection (eg, Paragonimus)
Related DDx ⬆