Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is normal . Mediastinal and hilar contours are unremarkable . The pulmonary vasculature is normal . Minimal streaky opacities in the lung bases likely reflect atelectasis . No focal consolidation , pleural effusion or pneumothorax is present . There are mild degenerative changes in the thoracic spine . Clips are seen within the upper abdomen .
    OUTPUT:
    
Mild bibasilar atelectasis . Otherwise no acute cardiopulmonary abnormality .