Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The patient is status post sternotomy . Heart size is normal . Mediastinal and hilar contours are unremarkable . There is crowding of the bronchovascular structures due to low lung volumes . Patchy opacities in the lung bases are concerning for areas of aspiration or infection . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Patchy bibasilar airspace opacities may reflect aspiration or infection .