Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chest PA and lateral radiograph demonstrate an unremarkable mediastinal and hilar contours . Heart size is top normal . Lungs are clear . No pleural effusion or pneumothorax identified . Atherosclerotic calcifications identified within the aortic arch . The patient has a pacemaker with leads positioned in the right atrium and right ventricle . Degenerative changes are noted in thoracic spine .
    OUTPUT:
    
No acute cardiopulmonary process .