Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is near - complete opacification of the left hemi thorax with only a small amount of residual aerated lung superiorly . There is mild mediastinal shift to the right . Compared to the outside film from the prior day that pleural effusion is increased in size and the mediastinal shift to slightly increased . The porta cath tip is at the caval atrial junction . The visualized portions of the right lung are well aerated . Some mild scarring is seen at the right base .
    OUTPUT:
    
Increased left pleural effusion with mediastinal shift to the right