Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lower lung volumes seen on the current exam . Bibasilar opacities are likely secondary to atelectasis . Superiorly , the lungs are clear . Cardiomediastinal silhouette is within normal limits . Tortuosity of the descending thoracic aorta is noted which is also notable for atherosclerotic calcifications at the arch . No acute osseous abnormalities .
    OUTPUT:
    
No acute cardiopulmonary process .