Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs were obtained . Areas of atelectasis are seen in both lung bases . No evidence of focal consolidation , effusion , or pneumothorax . The cardiomediastinal silhouette remains stable . The osseous structures appear grossly intact . Degenerative changes are again visualized throughout the thoracic spine . No free air is noted below diaphragm .
    OUTPUT:
    
Bibasilar atelectasis . No free air under the diaphragms .