Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a small to moderate - sized left pleural effusion which has decreased from the most recent prior study . There is no pneumothorax , right pleural effusion or focal airspace consolidation . There has been improvement in mild pulmonary edema and vascular engorgement . The cardiac silhouette is normal in slightly decreased from prior . Evidence of chronic lung disease and emphysema are again noted .
    OUTPUT:
    
Decrease in small to moderate left pleural effusion .