Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of chest demonstrate an extensive left - sided pleural effusion with compressive atelectasis ; an underlying pneumonia can not be excluded . A tiny right pleural effusion may also be present . The cardiac silhouette also appears enlarged , but it is difficult to completely assess the left border given the large pleural effusion . The right lung is clear of focal opacities worrisome for pneumonia . There is no pneumothorax .
    OUTPUT:
    
1 . Large left - sided pleural effusion with underlying atelectasis , underlying consolidation is not excluded . 2 . Difficult to assess , but possibly enlarging cardiac silhouette ; query underlying pericardial effusion