Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are well expanded and clear . The cardiac silhouette is mildly enlarged . The mediastinal silhouette and hilar contours are normal . No pleural effusion or pneumothorax is present . A left - sided pacer terminates with its leads in the right atrium and right ventricle . Sternal wires are intact .
    OUTPUT:
    
No evidence of acute intrathoracic process .