Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size remains mildly enlarged . The mediastinal and hilar contours are unchanged . Pulmonary vasculature is normal . The lungs are clear without focal consolidation . No pleural effusion or pneumothorax is identified . Degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .