Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is near complete opacification of the left hemithorax , with rightward shift of the mediastinal structures , consistent with large pleural effusion and collapse . A small portion of the left upper lung appears minimally aerated . Mild blunting of the right costophrenic angle appears chronic , but may reflect a small amount of pleural effusion . Assessment of the cardiac silhouette is limited . No pneumothorax .
    OUTPUT:
    
Near complete opacification of left hemithorax due to large pleural effusion and collapse .