Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild enlargement of cardiac silhouette is present . Thoracic aorta is unfolded . Mediastinal and hilar contours are otherwise unremarkable . Pulmonary vasculature is normal . Streaky opacities in lung bases likely reflect areas of atelectasis . No pleural effusion or pneumothorax is seen . Remote left third posterior rib fracture is present .
    OUTPUT:
    
Minimal atelectasis in the lung bases . No pulmonary edema .