Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Supine portable view of the chest demonstrates pacemaker device leads terminating in the right atrium and right ventricle , unchanged . Lung volumes are normal . There is no pleural effusion or pneumothorax . Biapical scarring is present . The heart is moderately enlarged . Retrocardiac opacities likely represent atelectasis . Hilar and mediastinal silhouettes are unchanged . Mediastinal contour remains enlarged , which likely relates to tortuous aorta . The aortic arch calcifications are present .
    OUTPUT:
    
1 . Pacemaker devise is in place and is unchanged in position . 2 . Moderate cardiomegaly , stable .