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 and do not suggest substantial lymph node enlargement . There is no pleural effusion or pneumothorax . The lungs appear clear . Mild degenerative changes are similar along the thoracic spine .
    OUTPUT:
    
No evidence of acute disease . No convincing evidence for sarcoidosis .