Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single lead pacemaker device appears unchanged . The heart is normal in size . The aortic arch shows calcification . The cardiac , mediastinal and hilar contours appear stable . There is no pleural effusion or pneumothorax . The lungs appear clear . There has been no significant change .
    OUTPUT:
    
No evidence of acute cardiopulmonary disease .