Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . The pulmonary vasculature is normal . Patchy bibasilar airspace opacities most likely reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax is identified . Moderate degenerative changes are noted within the thoracic spine .
    OUTPUT:
    
Patchy bibasilar airspace opacities most likely reflect atelectasis , but infection is not excluded in the correct clinical setting .