Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided AICD / pacemaker device is noted with leads terminating in the right atrium and right ventricle . There is moderate enlargement of cardiac silhouette which is unchanged . The mediastinal and hilar contours are stable . There is no pulmonary edema . Linear opacities in the lung bases are compatible with subsegmental atelectasis . No pleural effusion or pneumothorax is seen . A screw is noted projecting over the left scapula .
    OUTPUT:
    
Mild bibasilar atelectasis . Moderate cardiomegaly , unchanged , without pulmonary edema .