Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are very low . There is mild relative elevation of the right hemidiaphragm compared to the left . Within the limitation of technique , the cardiac , mediastinal , and hilar contours show no definite abnormality , and the lungs appear clear . There is no definite pleural effusion or pneumothorax . Moderate - to - severe S - shaped scoliosis appears similar .
    OUTPUT:
    
No definite acute disease on limited study with very low lung volumes .