Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . There is at least mild to moderate background pulmonary edema . Bibasilar opacities are likely due to moderately - sized pleural effusions , although superimposed atelectasis or pneumonia would be difficult to exclude . No pneumothorax . Severe cardiomegaly .
    OUTPUT:
    
1 . Mild to moderate background pulmonary edema . 2 . Worsening bibasilar opacities , largely due to moderately - sized pleural effusions . Superimposed atelectasis or pneumonia would be difficult to exclude . 3 . Low lung volumes .