Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The right pleural pigtail catheter is in stable position , and there has been slight decrease in size of a small right apicolateral pneumothorax . The left lung is clear , and the heart is normal in size .
    OUTPUT:
    
Stable position of a right pleural pigtail catheter with slight decrease in size of the right apicolateral pneumothorax .