Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior radiograph , there has been no interval change in the position of the pacemaker leads , which terminate in the right atrium and right ventricle . No evidence of lead fracture . Within the lungs , there are no pleural effusions or pneumothorax . Unchanged retrocardiac opacity likely represents atelectasis . Heart size is within upper limits of normal . Mediastinal and hilar contours are within normal limits . No acute osseous abnormalities .
    OUTPUT:
    
Pacemaker leads are unchanged in position , terminating in the right atrium and right ventricle .