Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are bilateral airspace opacities , left side greater than right , not significantly changed allowing for differences in patient positioning . There is improved left lower lung aeration . There is minimal right lower lung atelectasis . There is a small to moderate left pleural effusion , unchanged . There is no pneumothorax . The heart size is normal . A right - sided PICC ends in the mid SVC .
    OUTPUT:
    
1 . Unchanged bilateral airspace opacities , left greater than right . 2 . Improved left lower lung aeration . 3 . Unchanged small to moderate left pleural effusion .