Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is streaky atelectasis at the left lung base . The lungs are otherwise clear . The cardiomediastinal silhouette and hilar contours are unchanged . There is no pleural effusion or pneumothorax . There is no free air under the diaphragm . Degenerative changes are seen throughout the thoracic spine .
    OUTPUT:
    
Minimal left basilar atelectasis . No focal consolidation .