Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chest , PA and lateral . Low lung volumes cause crowding of the pulmonary vasculature at the bases . There is bibasilar atelectasis . The heart size is normal and the aorta is unfolded configuration . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
Low lung volumes with bilateral lower lobe atelectasis . However , superimposed aspiration or other infectious process can not be excluded .