Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided dual - chamber pacemaker is noted with leads terminating in the right atrium and right ventricle . The heart size is normal . The mediastinal and hilar contours are unchanged , with mild calcification of the thoracic aorta . The lungs are clear . Pulmonary vascularity is normal . No pleural effusion or pneumothorax is visualized . There are no acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary process .