Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Low lung volumes are noted . Linear bibasilar opacities are most likely atelectasis . There is no focal consolidation or effusion . The cardiomediastinal silhouette is within normal limits . Atherosclerotic calcifications noted at the aortic arch . Old healed posterior left rib fracture is noted . No acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes without definite superimposed acute cardiopulmonary process .