Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac silhouette size is normal . A descending thoracic aortic stent graft is noted . Mediastinal hilar contours are otherwise unremarkable . Pulmonary vasculature is not engorged . Low lung volumes are present with mild bibasilar patchy opacities , likely atelectasis . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes with probable mild bibasilar atelectasis .