Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided pacemaker device is noted with leads terminating in the right atrium and right ventricle , in unchanged positions . The cardiac , mediastinal and hilar contours are unchanged , with the heart size within normal limits . There is no pulmonary vascular congestion . Minimal streaky opacities in the lung bases most likely reflect atelectasis . No pleural effusion or pneumothorax is seen , and no focal consolidation is demonstrated . Multilevel degenerative changes are seen in the thoracic spine with anterior bridging osteophytes .
    OUTPUT:
    
Mild bibasilar atelectasis .