Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a new widening of the mediastinum at the level of the aortic knob . The left lung remains similarly expanded with a small amount of pleural fluid . There is subsegmental atelectasis of the right mid lung . The stomach is severely distended .
    OUTPUT:
    
Change in the upper left mediastinal contour , which may represent a pleural or mediastinal hematoma . Findings were discussed with Dr . ___ at 10 :05 a .m . at the time of discovery by Dr . ___ ___ telephone .