Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes remain low . This accentuates the size of the cardiac silhouette which is mildly enlarged , unchanged . Mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Minimal atelectasis is noted in the lung bases . No focal consolidation , pleural effusion or pneumothorax is present . Mild to moderate multilevel degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
Low lung volumes with mild bibasilar atelectasis .