Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart appears mildly enlarged . The mediastinal and hilar contours appear stable . There is no pleural effusion or pneumothorax . The lungs appear clear . Mild degenerative changes affect the lower thoracic spine . Thoracic spine curves mildly to the right , as before .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .