Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Improved aeration and decreased pleural densities on the right are seen compared to previous radiograph . Post surgical changes are noted in the right hemithorax . No focal consolidation or pulmonary edema is seen . Cardiac and mediastinal contours are unchanged .
    OUTPUT:
    
Both postsurgical changes and decrease in right pleural effusion .