Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been marked interval increase in diffuse interstitial opacities throughout both lungs , possibly with subtle confluent areas of alveolar opacity . Trace right pleural effusion and equivocal trace left pleural effusion appear new . Cardiomediastinal silhouette is grossly unchanged . No pneumothorax or frank consolidation identified .
    OUTPUT:
    
Findings consistent with interval development of CHF .