Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A chest tube has been placed into the left hemithorax since the prior study . A central venous catheter appears unchanged . The lung has mostly reexpanded with a suspected small residual pneumothorax primarily suggested by minimal lucency remaining at the left lung base . There is no shift of midline structures . There is patchy opacification in the left lower hemithorax , but suggesting atelectasis associated with a recent pneumothorax that has improved .
    OUTPUT:
    
Status post chest tube placement with small suspected residual pneumothorax . Continued radiographic followup suggested .