Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . The aorta remains tortuous . Mediastinal and hilar contours are within normal limits . Mild atelectasis is noted in both lung bases . Previously noted focal opacity in the right lower lobe has resolved . No new focal consolidation , pleural effusion or pneumothorax is seen . Multilevel degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
No radiographic evidence for pneumonia . Mild bibasilar atelectasis .