Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Large left pneumothorax is responsible for left lung collapse and reveals small left pleural effusion . No mediastinal shift or displacement of the left hemidiaphragm . Right lung is fully expanded and clear . Right pleural space , heart size , mediastinal and right hilar contours are normal . No displaced rib fracture is seen .
    OUTPUT:
    
Large left pneumothorax . Left lung entirely collapsed . No evidence of hemodynamic tension . Dr . ___ paged Dr . ___ at 10 :20 AM , 5 minutes after recognizing the findings , and they discussed the findings by telephone at 10 :20 AM on ___ .