Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size remains within normal limits . The aorta is tortuous . Previously seen right lower lobe mass has substantially decreased in size from the previous exam with residual right infrahilar opacity likely reflective of post-treatment change and / or residual disease . There is no pulmonary edema . The lungs are hyperinflated with emphysematous changes again demonstrated . Small right pleural effusion is noted with interval decrease in extent of lateral pleural thickening as seen on the prior study . Patchy opacities in the lung bases may reflect atelectasis . No pneumothorax is identified . Multilevel degenerative changes are seen in the thoracic spine . Bilateral shoulder arthroplasties are partially imaged .
    OUTPUT:
    
Substantial interval decrease in size of right lower lobe mass with residual right infrahilar opacity likely reflective of post-treatment changes and / or residual disease . Small right pleural effusion . Patchy opacities in the lung bases may reflect atelectasis but are nonspecific .