Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . The heart size is mildly enlarged but appear similar compared to previous exam . Mediastinal and hilar contours are unremarkable . There is crowding of the bronchovascular structures . Patchy bibasilar airspace opacities likely reflect atelectasis in the setting of low lung volumes . No pleural effusion or pneumothorax is identified . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes with probable bibasilar atelectasis .