Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is top normal . Mediastinal and hilar contours are unchanged . Pulmonary vasculature is normal . Lungs are clear . No pleural effusion or pneumothorax is demonstrated . There are mild to moderate multilevel degenerative changes re - demonstrated in the thoracic spine
    OUTPUT:
    
No acute cardiopulmonary abnormality .