Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The aorta is unfolded . Mediastinal and hilar contours are unchanged . Pulmonary vasculature is normal . Lungs are clear . No pleural effusion , focal consolidation or pneumothorax is demonstrated . There are mild degenerative changes in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .