Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bibasilar opacities presumed to be atelectasis or aspiration have slightly decreased . Mild pulmonary edema is unchanged in this patient with moderate cardiomegaly . NG tube is below the diaphragm . There is no pneumothorax .
    OUTPUT:
    
1 . Bibasilar opacities could be aspiration or atelectasis has slightly improved . 2 . Unchanged mild pulmonary edema .