Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly is unchanged . No pulmonary edema . Left - sided pigtail in situ . The left - sided pleural effusion is decreased in size . Small right - sided pleural effusion . No new areas of airspace consolidation . The right nipple is again visualized . Marked hyperinflation suggesting COPD .
    OUTPUT:
    
Interval decrease in size of the left - sided pleural effusion .