Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are within normal limits . Streaky atelectasis is noted in the lung bases . Pulmonary vasculature is not engorged . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities . Mild to moderate multilevel degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
Streaky bibasilar atelectasis .