Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is near complete opacification of the left hemithorax and shift of the mediastinal structures to the right concerning for a left pleural effusion . A sliver of aerated lung is seen in the medial left upper hemithorax . There is possible trace right apical pleural effusion . The right lung is otherwise clear without focal consolidation . No pneumothorax is seen
    OUTPUT:
    
Near opacification of the left hemithorax with shift of the mediastinum to the right worrisome for very large pleural effusion .