Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . There is a vague left infrahilar opacity , probably within the left lower lobe concerning for pneumonia . Elsewhere , the lungs appear clear . There are no pleural effusions or pneumothorax . The osseous structures appear within normal limits .
    OUTPUT:
    
Findings suggesting pneumonia in the left lower lobe .