Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Midline sternotomy wires again noted with partially imaged hardware stable as Ing the lumbar spine . Again noted is complete opacification of the left hemithorax and leftward shift of the mediastinum in this patient status post prior left pneumonectomy . Hiatal hernia is better appreciated on the prior CT . The right lung is clear . No pneumothorax . The heart and mediastinum can not be assessed . Residual barium noted within upper abdominal bowel loops . No evidence of subdiaphragmatic free air . Dextroconvex scoliosis of the upper thoracic spine is more pronounced . Clips projecting over the left hemithorax are unchanged .
    OUTPUT:
    
1 . No subdiaphragmatic free air . 2 . Right lung is clear . Post left pneumonectomy changes .