Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . A left pectoral pacemaker is seen with transvenous leads in the right atrium , right ventricle , and left coronary vein . The heart size is unchanged . No pneumothorax .
    OUTPUT:
    
Left pectoral pacemaker seen with transvenous leads in the RA , RV , and left coronary vein .