Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are relatively low . There is patchy bibasilar opacity . Superiorly , lungs are clear . The cardiomediastinal silhouette is within normal limits . Atherosclerotic calcifications are seen at the aortic arch . No acute osseous abnormalities .
    OUTPUT:
    
Bibasilar opacities which could be atelectasis in the setting of low lung volumes . Infection can not be excluded in the proper clinical setting .