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 . Moderate degenerative changes of the thoracolumbar spine appear similar including mild S - shaped curvature . The bones appear probably demineralized .
    OUTPUT:
    
No evidence of acute disease .