Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart appears at the upper limits of normal size . Moderate unfolding and calcification are noted along the thoracic aorta . Within the limitations of AP portable technique , the mediastinal and hilar contours are otherwise unremarkable . There is no pleural effusion or pneumothorax . The lungs appear clear .
    OUTPUT:
    
No evidence of acute disease .