Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs volumes are normal . Subtle opacity in the left lower lobe could reflect early pneumonia . No pleural effusion or pneumothorax . Heart is normal size . Mediastinal and hilar contours are unremarkable .
    OUTPUT:
    
Subtle opacity in the left lower lobe could reflect early pneumonia in the correct clinical setting .