Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are unchanged , with a large hiatal hernia again noted containing an air - fluid level . The pulmonary vascularity is not engorged . There are streaky opacities in the lung bases likely reflective of atelectasis . No large pleural effusion or pneumothorax is present . There are multilevel degenerative changes of the thoracic spine . Calcification of the thoracic aorta is again noted .
    OUTPUT:
    
Large hiatal hernia with mild bibasilar atelectasis .