Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to chest radiograph from 1 day prior , pulmonary vascular congestion has improved . Increasing retrocardiac opacity can be worsening edema . Small left effusion has increased . Minimally displaced left rib fracture are difficult to appreciate . No definite pneumothorax .
    OUTPUT:
    
No visualized pneumothorax . Slight increase in left lower lobe effusion .