Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP upright portable chest radiograph is obtained . A left chest wall pacer device is again seen with lead tips extending into the right atrium and ventricle . Abandoned pacing leads are also seen in the right chest wall , extending into the right heart , not significantly changed . The heart is mildly enlarged . The lungs appear clear without definite signs of pneumonia or CHF . No large effusion or pneumothorax is seen . The overall cardiomediastinal silhouette is stable . Bony structures are intact .
    OUTPUT:
    
No acute findings in the chest . Stable mild cardiomegaly . Multiple pacer wires are unchanged in position .