Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided pacemaker with the tips in the right atrium and right ventricle . No pneumothorax . The lungs are clear . The cardiomediastinal silhouette is unremarkable . No pleural effusions .
    OUTPUT:
    
Left - sided pacemaker with the tips in the right atrium and right ventricle . No pneumothorax .