Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . A dual lead left chest wall pacer is again seen . The heart size is mildly enlarged , as before , with normal cardiomediastinal contours . Lungs are clear without focal or diffuse abnormality . The pulmonary vasculature is unremarkable . No pleural effusion or pneumothorax . Osseous structures demonstrate no acute abnormality .
    OUTPUT:
    
No acute cardiopulmonary process .