Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post median sternotomy with re-demonstration of fracture of the most inferior wire . Patient is also status post CABG . Low lung volumes are present . There is crowding of the bronchovascular structures . Streaky opacities in the lung bases likely reflect atelectasis , though infection can not be completely excluded . No pleural effusion or pneumothorax is present . There is no overt pulmonary edema . Mild degenerative changes of the thoracic spine are present .
    OUTPUT:
    
Low lung volumes limit assessment of the lung bases . There is likely mild bibasilar atelectasis . Infection at the lung bases can not be completely excluded , and a repeat exam with increased inspiratory effort may be useful .