Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Is moderately enlarged , accentuated by the low lung volumes . Similarly , widening of the superior mediastinum and crowding of the bronchovascular structures are due to low lung volumes . No overt pulmonary edema is present . Patchy opacities in the lung bases may reflect areas of atelectasis though infection is not excluded . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes with patchy bibasilar airspace opacities , likely atelectasis though infection can not be completely excluded .