Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to ___ , stable left moderate pleural fluid with interval decrease in the retrocardiac opacity . The right lung is clear . Moderate cardiomegaly . Displaced left - sided rib fractures are again demonstrated . No pneumothorax .
    OUTPUT:
    
Stable left moderate pleural fluid with interval decrease in the retrocardiac opacity .