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 . The pulmonary vasculature is normal . Streaky opacities in the lung bases may reflect atelectasis . No pleural effusion , focal consolidation or pneumothorax is visualized . There are clips seen in the right upper quadrant of the abdomen compatible with prior cholecystectomy . Mild degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
Mild bibasilar atelectasis in the setting of low lung volumes .