Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear stable . There is no pleural effusion or pneumothorax . No pneumomediastinum is visible . The lungs appear clear . There is similar degenerative changes along the thoracic spine . There has been no significant change .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .