Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Left - sided dual - chamber pacemaker device is noted with leads in the right atrium and right ventricle , unchanged . Heart size is normal . The aorta is tortuous with atherosclerotic calcifications noted at the aortic knob . Mediastinal and hilar contours are otherwise unremarkable . There is chronic elevation of the right hemidiaphragm . Bibasilar patchy opacities likely reflect areas of atelectasis . No pleural effusion or pneumothorax is present . Multilevel degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
Bibasilar atelectasis and chronic elevation of the right hemidiaphragm .