Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left small - to - moderate apical pneumothorax has slightly decreased in size , and a left chest tube ends in the apex . Previous left mid - to - lower lung opacities have partially cleared , but a left pleural effusion has slightly increased in size . Right - sided calcified pleural plaques and left subcutaneous emphysema are again seen . Cardiac and mediastinal contours are unchanged .
    OUTPUT:
    
Left small - to - moderate pneumothorax has slightly decreased in size .