Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is ill - defined opacity overlying the left lower lobe which likely represents pneumonia . The right lung is clear . Cardiomediastinal silhouette is normal . There is no pleural effusion or pneumothorax . Osseous structures are normal .
    OUTPUT:
    
Ill - defined opacity overlying the left lower lobe compatible with pneumonia .