Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The mediastinal and hilar contours are unremarkable . The pulmonary vasculature is normal . Patchy opacities are noted in the lung bases , which could reflect atelectasis or pneumonia . No pleural effusion or pneumothorax is identified . No acute osseous abnormality is detected .
    OUTPUT:
    
Patchy bibasilar airspace opacities , potentially atelectasis but infection can not be excluded in the correct clinical setting .