Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low with bibasilar linear opacities , which are most likely atelectasis . There is mild pulmonary edema with trace pleural effusions . There is no pneumothorax . The mediastinal contours are normal . The heart is enlarged , though not significantly changed from the prior exam .
    OUTPUT:
    
1 . Mild edema and trace pleural effusions . 2 . Unchanged moderate cardiomegaly . 3 . Bibasilar opacities in the setting of low lung volumes , likely represent atelectasis .