Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There are low lung volumes which accentuate the bronchovascular markings . Given this , there is increase in interstitial markings bilaterally in a perihilar distribution as compared to earlier today , raising concern for mild interstitial edema . The superior mediastinum , while prominent , is less prominent as compared to the prior study . Cardiac silhouette is stable . No large pleural effusion is seen , although a trace right pleural effusion is difficult to exclude . No evidence of pneumothorax .
    OUTPUT:
    
Interval mild increase in interstitial markings bilaterally suggests mild interstitial edema . Possible trace right pleural effusion .