Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild enlargement of the cardiac silhouette is re - demonstrated . The mediastinal and hilar contours are unchanged . The pulmonary vasculature is not engorged . Minimal patchy opacities in the lung bases likely reflect atelectasis . No pleural effusion , focal consolidation or pneumothorax is present . Hypertrophic changes are re - demonstrated in the thoracic spine .
    OUTPUT:
    
Mild bibasilar atelectasis . No pulmonary edema .