Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . The mediastinal and hilar contours are normal . Pulmonary vasculature is normal . Minimal atelectasis is seen in the lung bases without focal consolidation . No pleural effusion or pneumothorax is present . Mild degenerative changes are seen in the thoracic spine .
    OUTPUT:
    
Minimal bibasilar atelectasis . Otherwise , no acute cardiopulmonary process .