Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interval placement of dual lead pacing device with leads terminating in the expected locations of the right atrium and right ventricle , with no visible pneumothorax . Heart size is normal . The mediastinal and hilar contours are remarkable for a tortuous thoracic aorta . The pulmonary vasculature is normal . Mild elevation of left hemidiaphragm is accompanied by focal linear left basilar atelectasis or scar . . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Appropriate placement of dual - chamber pacemaker with no visible pneumothorax .