Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Opacification of the right mid and lower hemithorax is new since ___ , consistent with large pleural effusion and atelectasis . Concurrent pneumonia is possible . Remaining aerated right apex is clear . Opacification of the left lower hemithorax is also new , consistent with an increasing , now moderate pleural effusion . Concurrent pneumonia is possible . Aerated portions of the left lung are clear . Heart size can not be assessed , borders obscured by the bilateral opacities . Dextroconvex curvature of the upper thoracic spine could be positional .
    OUTPUT:
    
Bilateral large right and moderate left pleural effusion , markedly increased since ___ . Underlying pneumonia can not be excluded .