Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Subtle opacity projects over the lower spine on the lateral view and could be due to a early / mild consolidation due to pneumonia . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Posterior left lower lobe opacity could be due to early / mild pneumonia .