Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is mildly enlarged , unchanged . Mediastinal and hilar contours are similar , with unchanged prominence of the right hilum . Pulmonary vasculature is normal . Linear opacities in both lung bases are compatible with areas of subsegmental atelectasis . No focal consolidation , pleural effusion or pneumothorax is identified . Remote right - sided rib fractures are re- demonstrated . There are mild degenerative changes in the thoracic spine .
    OUTPUT:
    
Bibasilar subsegmental atelectasis . No focal consolidation to suggest pneumonia .