Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to chest radiograph from earlier today , persistent dense retrocardiac opacification persists , slightly improved since the prior . Pulmonary vascular congestion has increased . At least moderate left effusion is again demonstrated .
    OUTPUT:
    
Improved aeration of the left lung . However persistent left lower lobe opacification . Increasing pulmonary congestion .