Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are bibasilar opacities , left greater than right . Superiorly , the lungs are clear . The cardiomediastinal silhouette is unchanged given differences in projection . Aortic core valve device is less clearly identified on today 's exam . No displaced fractures identified , degenerative changes noted at the shoulder on the left .
    OUTPUT:
    
Bibasilar opacities , left greater than right . These could be due to atelectasis noting that infection would also be possible in the proper clinical setting .