Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild enlargement of cardiac silhouette is demonstrated . The aorta is slightly unfolded . The mediastinal and hilar contours are otherwise unremarkable . Pulmonary vasculature is normal . Linear opacities in the right lung base are compatible with subsegmental atelectasis or scarring . Remainder of the lungs are clear . No pleural effusion or pneumothorax is present . There are mild degenerative changes noted in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .