Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is opacification of approximately ___ of the left hemithorax with aeration at the left lung apex and a meniscus , suggesting that this is due to a large pleural effusion with underlying atelectasis . Underlying consolidation can not be excluded . There is rightward shift of mediastinal structures . There is a small right pleural effusion and vague opacification of the right lung base , which is improved but not entirely resolved compared to prior . No pneumothorax is detected . Heart size can not be well evaluated in the setting of overlying left pleural effusion . Aortic knob calcification is seen . The stomach bubble appears to be inferiorly displaced relative to the right hemidiaphragm , suggesting downward mass effect on the left hemidiaphragm by the left pleural process . Pigtail projecting over the right upper quadrant is incompletely imaged .
    OUTPUT:
    
1 . Large left pleural effusion with rightward shift of mediastinal structures . Findings were reported to ___ by ___ by telephone at 4 :05 p .m . on ___ at the time of discovery of these findings . 2 . Improved but persistent opacity at the right lung base .