Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are clear . The cardiomediastinal silhouette is unchanged . A left pectoral pacemaker seen with transvenous leads in the right atrium and right ventricle . No pneumothorax , pleural effusion , or pulmonary edema .
    OUTPUT:
    
Left pectoral pacemaker with transvenous leads in the right atrium and right ventricle . No pneumothorax .