Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lower lung volumes seen on the current exam . There are streaky left - greater - than - right bibasilar opacities which are most likely atelectasis . The lungs are otherwise clear . The cardiomediastinal silhouette is within normal limits . No acute osseous abnormalities . Surgical clips seen in the upper abdomen suggest prior cholecystectomy .
    OUTPUT:
    
Bibasilar opacit atelectasis without definite acute cardiopulmonary process .