Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . There is no pleural effusion or pneumothorax . The lungs appear clear . Prior healed rib fractures are noted on the left . A severe thoracolumbar vertebral compression fracture , probably T12 , shows no evidence for change . There is , however , below that level , moderate to severe new subchondral sclerosis at the level below , probably L1 - L2 , suggesting coinciding degenerative change , with milder changes at the intervening level , likely T12 - L1 .
    OUTPUT:
    
No evidence of acute disease .