Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are low in volume but clear . The cardiac silhouette is enlarged , unchanged . The mediastinal silhouette is prominent , unchanged . The hilar contours and pleural surfaces are normal . No pleural effusion or pneumothorax is present . A right - sided pacer with its leads terminating in the right atrium and right ventricle and abandoned left - sided leads are unchanged as well .
    OUTPUT:
    
No acute intrathoracic process .