Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild to moderate cardiomegaly is unchanged . Calcification of the aorta is again noted . The mediastinal and hilar contours are unchanged . There is no pulmonary vascular congestion . Minimal linear opacities are noted within the lung bases , which could reflect atelectasis . No focal consolidation is seen . There is no pneumothorax . Minimal blunting of the costophrenic angles posteriorly may suggest the presence of tiny bilateral pleural effusions . There are multilevel degenerative changes in the thoracic spine .
    OUTPUT:
    
Mild bibasilar atelectasis and possible minimal bilateral pleural effusions .