Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Relatively low lung volumes is seen with secondary crowding of the bronchovascular markings . Linear bibasilar opacities are likely secondary to atelectasis . The cardiomediastinal silhouette is within normal limits . Degenerative changes are noted at the left shoulder .
    OUTPUT:
    
Low lung volumes without definite acute cardiopulmonary process .