Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is exaggerated due to low lung volumes but is appears moderately enlarged . Widening of the mediastinum is likely due to low lung volumes . There is crowding of the bronchovascular structures without overt pulmonary edema . Patchy opacities in the lung bases likely reflect atelectasis . No pleural effusion or pneumothorax is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes with probable bibasilar atelectasis .