Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Two views of the chest demonstrate a left chest pacemaker with an unchanged appearance of atrial and ventricular leads . The cardiac silhouette is top normal in size . The main pulmonary artery contour remains enlarged . The pulmonary vasculature is otherwise normal appearing . The lungs are clear . There is no effusion , or pneumothorax .
    OUTPUT:
    
Stable mild prominence of the cardiac silhouette , and enlargement of the main pulmonary artery , without acute chest pathology .