IMPRESSION:
1.  There continues to be bilateral interstitial process, but this has
 improved since the prior study, and is more similar to baseline of ,
 therefore, likely reflecting chronic age-related or small airways changes. 
 More focal patchy opacity at the left base likely reflects compressive
 atelectasis given the pleural effusion, although pneumonia can not be
 excluded.  No pneumothorax is seen.  Overall, cardiac and mediastinal contours
 are stable.