Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The cardiac , mediastinal and hilar contours are unchanged , with a small hiatal hernia again noted . Pulmonary vascularity is not engorged . Minimal bibasilar streaky opacities likely reflect atelectasis . No pleural effusion , focal consolidation or pneumothorax is present . Degenerative changes of both acromioclavicular joints are seen .
    OUTPUT:
    
Mild bibasilar atelectasis .