Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The mediastinal and hilar contours are unremarkable . Pulmonary vasculature is normal . Minimal streaky opacities in the lung bases likely reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . Upper lobe predominant emphysema is re - demonstrated . Mild degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .