Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Extremely low lung volumes . Heart size is normal . The mediastinal and hilar contours are normal . The pulmonary vasculature is normal . Bibasilar atelectasis . Lungs are otherwise clear . No pleural effusion or pneumothorax is seen . There are no acute osseous abnormalities .
    OUTPUT:
    
Low lung volumes without definite acute cardiopulmonary process .