Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is normal . Mediastinal and hilar contours are unremarkable . Streaky opacities are demonstrated in the lung bases most likely reflective of atelectasis . No focal consolidation , pleural effusion or pneumothorax is visualized . Multilevel degenerative changes are noted in the thoracic spine .
    OUTPUT:
    
Low lung volumes with bibasilar atelectasis .