Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiomediastinal and hilar contours are stable . There is no pleural effusion or pneumothorax . Lungs are well expanded . Increased density projecting over the right mid lung persists and may be slightly worse , but the left mid lung field appears improved . However , there is dense retrocardiac opacity which may reflect atelectasis or an infiltrate . Additionally , increased interstitial markings is concerning for interstitial edema .
    OUTPUT:
    
1 . Persistent opacity in the right mid lung with new left retrocardiac opacity , concerning for an ongoing infectious process . Lingular opacity is improved . 2 . Mild interstitial edema .