Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bibasilar opacities are most likely secondary to atelectasis especially given lower lung volumes . Superiorly , the lungs are clear . The cardiomediastinal silhouette is stable . Coronary artery stents are identified . No acute osseous abnormalities , old healed right posterior rib fractures are noted .
    OUTPUT:
    
Lower lung volumes without definite superimposed cardiopulmonary process .