Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low with moderate bibasilar and retrocardiac atelectasis . The left pectoral pacemaker is stable with leads in unchanged positioning . Chronic severe cardiomegaly is unchanged . No pneumothorax .
    OUTPUT:
    
1 . Moderate bibasilar and retrocardiac atelectasis . No pneumothorax .