Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is near complete opacification of the left hemi thorax with slight increase in aeration of the left upper lung . The majority of the left hemi thorax remains opacified . A pigtail catheter is seen projecting over the lateral left lower hemi thorax . The right lung is grossly clear .
    OUTPUT:
    
Near complete opacification of the left hemi thorax with slight improvement and slight increase in aeration at the left upper lung .