Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac and mediastinal silhouettes are stable , with the cardiac silhouette mildly enlarged . There is subtle increased interstitial markings bilaterally , with basal predominance , suggesting chronic interstitial lung disease , mild underlying interstitial edema not excluded . No large pleural effusion or pneumothorax is seen . Slight increase in opacity at the right lung base may relate to chronic lung disease , however , underlying aspiration is not excluded .
    OUTPUT:
    
Subtle increase in interstitial markings diffusely bilaterally , with basal predominance , suggest chronic interstitial lung disease , mild underlying interstitial edema not excluded . Slight increase in opacity at the right lung base may relate to the aforementioned chronic lung disease , however , underlying aspiration not excluded .