Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is borderline enlarged . Mediastinal and hilar contours are within normal limits . Pulmonary vascularity is normal and the lungs are clear . No pleural effusion or pneumothorax is visualized . There are mild degenerative changes in the thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary abnormality .