Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . The mediastinal and hilar contours appear within normal limits . A small lung nodule projects over the lateral left lower lobe without any indication that it may have changed . Otherwise , the lungs appear clear . There are no pleural effusions or pneumothorax . There is a similar moderate reversed S - shaped convex curvature to the thoracic spine with mild multilevel degenerative changes . The bones appear demineralized .
    OUTPUT:
    
1 . No evidence of acute disease . 2 . Small nodule in the left lower lobe , previously shown to exhibit long - term stability .