Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . The heart size is likely top normal . The mediastinal contour is notable for unfolding of the thoracic aorta . There is crowding of the bronchovascular structures , but no pulmonary edema is seen . No focal consolidation , pleural effusion or pneumothorax is noted , though there is mild bibasilar atelectasis . No acute osseous abnormality is seen .
    OUTPUT:
    
Mild bibasilar atelectasis in the setting of low lung volumes .