Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were obtained . There is near - complete opacification of the right hemithorax with only a small amount of aerated lung at the right apex . Heart is normal in size , and there is no significant shift of the cardiomediastinal silhouette . The left lung is clear . Nonvisualization of the right bronchus may be due to mucus plugs . There is slight blunting of the left costophrenic sulcus as compared to the prior study . There is no pneumothorax .
    OUTPUT:
    
1 . Markedly increased large right pleural effusion with only a small amount of aerated lung remaining at the apex . 2 . Interval development of a small left pleural effusion . 3 . Nonvisualization of the right bronchus may be due to mucus plugs .