Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Moderate to severe enlargement of the cardiac silhouette is present . The aorta is mildly tortuous with atherosclerotic calcifications noted at the aortic knob . The pulmonary vasculature is normal and the hilar contours are unremarkable . Minimal atelectasis in the lung bases is demonstrated with longitudinally oriented linear opacity in the right lung base , likely an area of scarring . Remainder of the lungs are clear without focal consolidation . No pneumothorax or pleural effusion is evident . There mild degenerative changes seen in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .