Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is normal . Mediastinal and hilar contours are unchanged . The pulmonary vascularity is not engorged . Minimal patchy opacity within the left lower lobe could reflect an area of infection , best seen on the lateral view . No pleural effusion or pneumothorax is identified . Bilateral pleural thickening laterally is unchanged .
    OUTPUT:
    
Patchy left lower lobe opacity could reflect an area of infection .