Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since earlier same day chest radiograph , left moderate pneumothorax is significantly improved following left chest tube placement . No definite signs of tension . Multiple pulmonary nodules are again seen , likely metastatic . Stable appearance of top - normal cardiac size . Unchanged placement of left - sided pacer with leads in the right atrium and right ventricle .
    OUTPUT:
    
1 . Vast improvement in known left pneumothorax following chest tube placement since earlier same day chest radiograph .