Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There has been interval removal of the right pacemaker and placement of a new left pacemaker which is intact with leads in the appropriate positions located in the right atrium and right ventricle . The lung volumes are stable . The cardiomediastinal and hilar contours are normal . The pleural surfaces are normal . No pneumothorax .
    OUTPUT:
    
Left pacemaker intact with leads in the appropriate positions . No pneumothorax . No pulmonary edema .