Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild enlargement of the cardiac silhouette is visualized . The mediastinal contours are unchanged with mild tortuosity of the thoracic aorta again noted . There is mild to moderate pulmonary edema , new from the prior exam . Additionally , patchy opacities in the lung bases may reflect infection or atelectasis . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities . Radiopaque density is noted projecting over the left inferior chest , unchanged .
    OUTPUT:
    
Mild to moderate pulmonary edema and patchy bibasilar airspace opacities , possibly infection or atelectasis .