Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A large ___ tension pneumothorax is present with rightward shift of mediastinal structures , and collapse of the left lung . There is widening of the intercostal spaces on the left compared to the right . The right lung is clear . No pleural effusion is present . No acute osseous abnormalities detected .
    OUTPUT:
    
Large left tension pneumothorax . A pigtail catheter has already been placed at the time of discovery of this finding at 1 :39 PM , ___ .