Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs were obtained . A large left pneumothorax is associated with rightward shift of mediastinal structures and a small amount of pneumomediastinum . The right lung is clear . There is no nodule or effusion . Cardiac and mediastinal contours are normal .
    OUTPUT:
    
1 . Large left pneumothorax causes rightward shift of the mediastinum concerning for tension . 2 . Small pneumomediastinum .