Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is normal in size . There is mild tortuosity along the descending aorta . The arch shows patchy calcification . Within the limitations of technique , the mediastinal and hilar contours appear otherwise within normal limits . There is no pleural effusion or pneumothorax . The lungs appear clear .
    OUTPUT:
    
No evidence of acute disease .