Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is normal . Mediastinal and hilar contours are unremarkable . Pulmonary vascularity is not engorged . Streaky bibasilar airspace opacities likely reflect atelectasis . Infection is not excluded . There is no pleural effusion or pneumothorax . Mild degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
Mild streaky bibasilar opacities likely reflect atelectasis . Infection can not be excluded . No pleural effusion .