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 no pleural effusion or pneumothorax . The lungs appear clear . A mild - to - moderate mid thoracic anterior wedge compression deformity appears unchanged . Mild degenerative changes throughout the thoracic spine are also similar . A partly visualized posterior fusion is noted along the lower thoracic spine . Healed left posterolateral sixth and seventh rib fractures appear unchanged .
    OUTPUT:
    
No evidence of acute disease .