Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac silhouette size is normal . Mediastinal and hilar contours are unchanged and within normal limits . The pulmonary vascularity is normal . No focal consolidation , pleural effusion or pneumothorax is demonstrated . Mild degenerative changes are seen within the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .