Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are minimal heterogeneous bibasilar opacities . The lungs are otherwise clear . The hilar and cardiomediastinal contours are normal . There is no pneumothorax . There is no pleural effusion . Pulmonary vascularity is normal .
    OUTPUT:
    
Minimal bibasilar opacities likely represent atelectasis , but infection can not be excluded in the appropriate clinical setting .