Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Again seen is rightward position of the mediastinal structures with relative hypoventilation of the right lung relative to the left . Low lung volumes . The patient is status post median sternotomy . The inferior - most sternotomy wire is broken , as before . Heart size is mildly enlarged , as before . There is bibasilar and perihilar atelectasis . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Bibasilar and perihilar atelectasis . Infection can not be excluded in the proper clinical setting .