Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Persistent layering bilateral pleural effusions with associated bibasilar atelectasis is unchanged . Mild interstitial edema particularly at the lung bases is noted . Left retrocardiac opacities obscure the left hemidiaphragm . There is no pneumothorax .
    OUTPUT:
    
Left retrocardiac opacities may be due to atelectasis or effusion , however , infection can not be excluded given the appropriate clinical circumstance . Mild interstitial edema . Persistent bilateral layering effusions and bibasilar atelectasis .