Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Improved right pleural effusion and perihilar opacification . Small bilateral pleural effusions remain . Unchanged appearance of left PICC . Heart size , borders , and mediastinal contours are unchanged .
    OUTPUT:
    
1 . Improved right pleural effusion and perihilar opacification . 2 . Small bilateral pleural effusions remain .