Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is slight increase in interstitial markings bilaterally which could be due to chronic lung disease versus minimal interstitial edema . No pleural effusion or pneumothorax is seen . The cardiac silhouette is top - normal to mildly enlarged . Mediastinal contours are grossly stable .
    OUTPUT:
    
Subtle increase in interstitial markings bilaterally could be due to minimal interstitial edema versus chronic lung disease .