Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a pacemaker overlying the left chest , with the leads terminating in the right atrium and right ventricle , which appear unchanged in comparison to the prior chest radiograph . Stable enlargement of the cardiac silhouette . The right lung mass appears unchanged in size since ___ . The lungs are otherwise clear . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . No pleural effusion or pneumothorax is seen .
    OUTPUT:
    
No evidence of congestive heart failure .