Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate slight interval decrease in size in a moderate left pleural effusion and trace right pleural effusion . The lungs are clear . There is no pneumothorax . The pulmonary vasculature is normal . Cardiac silhouette is top normal .
    OUTPUT:
    
Interval decrease in a moderate - sized left pleural effusion .