Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low with secondary bibasilar atelectasis . Superiorly , the lungs are clear . The cardiomediastinal silhouette is within normal limits . Although not well assessed , there is apparent sclerosis at the humeral heads bilaterally , likely in part due to degenerative changes .
    OUTPUT:
    
Low lung volumes without definite acute cardiopulmonary process .