Staphylococcus Pneumonia Etiology: < 1 year old has endobronchial spread, older children have hematogeneous spreadImaging: can cause effusion / empyema in 90%, pneumatocele (50%), pneumothorax (10%) Cases of Staphylococcus Pneumonia CXR shows a large thin walled cystic lesion in the left lower lobe. CXR shows a round cavitary lesion with an air-fluid level in the left upper lobe.