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 . There is slight pleural thickening along each lateral hemithorax . Otherwise , pleural surfaces are unremarkable . The lungs appear clear . There is a thin anterior flowing osteophyte along several lower thoracic levels .
    OUTPUT:
    
No evidence of acute disease .