Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left anterior chest wall dual lead pacer is unchanged . Heart size is top - normal . Cardiomediastinal silhouette and hilar contours are unremarkable . Lungs are clear . Pleural surfaces are clear without effusion or pneumothorax .
    OUTPUT:
    
No acute cardiopulmonary abnormality . Note that pacer obscures part of the left upper lobe .