Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bilateral lung volumes are low . Large opacity in the left upper lung is concerning for pneumonia ; however , possibility of mass lesion can not be ruled out . Left - sided pleural effusion is minimal . Heart size , mediastinal and hilar contours are normal . Minimal opacity at the right lung base is likely atelectasis .
    OUTPUT:
    
1 . Large left upper lung consolidation is likely pneumonia ; however , a possibility of lung mass can not be ruled out . If prior chest radiographs are made available , a comparison can be made and addendum can be added to the report accordingly . 2 . Small left pleural effusion and mild right lower lung atelectasis . Dr . ___ was paged and findings were discussed by phone at 12 :20 p .m . on ___