Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a large left - sided pneumothorax . There is no tension . The right lung is clear . The hilar and mediastinal contours are unremarkable . The heart is normal in size . There are no pleural effusions .
    OUTPUT:
    
Large left - sided pneumothorax . No evidence of tension . These findings were discussed with Dr . ___ at 1 :44 p .m . by Dr . ___ by telephone on the day of the exam , approximately 5 minutes after the exam was opened .