Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A permanent pacer is again noted with leads terminating in the right atrium and right ventricle in satisfactory position . The metallic portion of an aortic valve prosthesis is again visualized . Sternotomy wires are also present . Heart size remains normal . The mediastinal and hilar contours are normal . There is no pleural effusion or pneumothorax . The lungs are clear .
    OUTPUT:
    
1 . Expected normal position of permanent pacer electrodes . 2 . Stable chest radiograph , no pneumothorax .