Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are clear . Heart is normal size . The dilated ascending aorta , documented on CT scanning ___ , is responsible for stable convexity of the mediastinum . Assessing change in the aneurysm would require repeat CT or ultrasound . There are no pleural abnormalities .
    OUTPUT:
    
No evidence of acute cardiac or pulmonary process . Chronic ascending thoracic aortic aneurysm .