What is the differential dx of lung abscess?

Typically dx by CXR (pulmonary infiltrate, with cavity (necrosis)) May be necrotizing infections, empyema with air-fluid level (hydropneumothorax), septic pulmonary emboli (infectious causes) Pulmonary embolism, vasculitis, neoplasm, broncheictasis, sarcoidosis, rheumatic nodule, foreign body aspiration (non-infectious causes)