Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A double lumen right central venous catheter terminating in the right atrium . A left - sided pacer device has three leads in stable position . Median sternotomy wires are midline and intact . The retrocardiac opacity on the lateral view is likely scarring . The cardiomediastinal silhouette , and hilar contours are normal . There is mild stable cardiomegaly . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
1 . No acute intrathoracic process . 2 . Mild cardiomegaly is stable .