Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral chest radiograph is compared to prior radiograph dated ___ . Relative to prior study , the appearance of the thorax is unchanged without a focal opacity convincing for pneumonia . Heart is mildly enlarged . There is no overt pulmonary edema . No large pleural effusion or pneumothorax is present . A left chest pacer is identified , its leads in similar position . Hilar and mediastinal contours are within normal limits . Calcifications about the aortic arch are noted as is a coronary artery stent . No acute osseous abnormality is detected .
    OUTPUT:
    
No acute cardiopulmonary process .