Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal radiograph of the chest shows interval left pleural catheter placement with substantial improvement in left - sided pleural effusion . There is no change in the small right pleural effusion . Monitoring and support devices are unchanged . No pneumothorax .
    OUTPUT:
    
Satisfactory positioning of left pleural catheter with marked improvement in left pleural effusion and no pneumothorax .