Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is near - complete opacification of the right hemithorax with just a small amount of aeration seen at the medial right apex . The left lung is clear . No left pleural effusion is seen . No pneumothorax is seen . The right aspect of the cardiac and mediastinal silhouettes are difficult to assess due to the large opacification over the right hemi thorax . The left sided borders of the heart and mediastinum are unremarkable .
    OUTPUT:
    
Near complete opacification of the right hemithorax with just a small amount of aeration at the medial right apex , likely due to underlying pleural effusion and overlying atelectasis . The mediastinum is shiftly slightly to the left .