Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a left pigtail chest catheter . A small to moderate left apical and lateral pneumothorax is relatively unchanged since the interventional study . There is no right pneumothorax . There is a small left pleural effusion . The cardiac and mediastinal contours are stable . The right lung is grossly clear .
    OUTPUT:
    
Stable appearance of the small to moderate apical and lateral left pneumothorax since the CT procedure performed 4 hours prior .