Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with the prior chest x-ray , hyperinflated lungs with flattened diaphragms are consistent with COPD . Cardiomediastinal and hilar silhouettes are unchanged . Increased opacification in the retrocardiac region could indicate developing consolidation .
    OUTPUT:
    
Increased retrocardiac opacification could indicate developing consolidation or infection , particularly if the patient has the appropriate symptoms .