Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Interval placement of a right chest wall pacemaker , with leads terminating in the right atrium and right ventricle . No pneumothorax . The heart size , mediastinal , and hilar contours are normal . There is mild streaky atelectasis at the left lung base . The lungs are otherwise clear without pleural effusion .
    OUTPUT:
    
Interval placement of a right - sided pacemaker , with leads terminating in the right atrium and right ventricle . No pneumothorax .