Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and show mild interstitial opacities . The cardiomediastinal silhouette , hilar contours , and pleural surfaces are normal . No pleural effusion or pneumothorax is present .
    OUTPUT:
    
Unchanged interstitial opacities were better characterized on recently performed chest CT . It could be related to chronic interstitial lung disease with overlying edema .