Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Positioning of patient limits evaluation of lung bases and chest tube seen on prior study . Previous left pneumothorax is no longer seen . There is a interval increase in subcutaneous emphysema now extending to bilateral chest wall and neck .
    OUTPUT:
    
Previous left pneumothorax no longer visualized . Interval increase in subcutaneous emphysema now extending to bilateral chest wall and neck . Patient positioning limits evaluation of lung bases and previously seen chest tube .