Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval placement of a new left - sided chest tube , with significant interval decrease in the left pneumothorax . A small residual left pneumothorax persists . Unchanged positioning of the pigtail catheter , endotracheal tube , right IJ line , and right pleural catheter .
    OUTPUT:
    
Interval placement of a new left - sided chest tube , with significant decrease in the size of the left pneumothorax . Persistent small left pneumothorax .