Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were reviewed and compared to the most recent prior study . A pigtail catheter located in the left hemithorax is unchanged in position . A small pneumothorax adjacent to the left cardiac border extending to the left apex is unchanged . Opacity obscuring the left mediastinal border is also unchanged and may represent extensive left lung atelectasis . There is atelectasis in the right lower lung but is otherwise clear . Left internal jugular line ends in the cavoatrial junction . Left lower rib fractures and subcutaneous air are again noted .
    OUTPUT:
    
1 . Unchanged small left pneumothorax adjacent to the left cardiac border extends to the left apex . 2 . Opacity obscuring the right mediastinal border may represents extensive left lung atelectasis .