Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is severe leftward convex curvature along the upper thoracic spine with posterior fixation devices . Mild - to - moderate rightward compensatory upper lumbar curvature is noted . The heart is normal in size . The mediastinal and hilar contours are unremarkable . The lungs appear clear . There are no pleural effusions or pneumothorax .
    OUTPUT:
    
No evidence of acute disease .