Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is top normal with redemonstration of aneurysmal dilatation of the thoracic aorta , similar in appearance to recent two prior examinations and was better characterized on prior CTA examination . Hilar contours are not well evaluated due to mediastinal widening from aneurysm . A 6 mm calcification projecting over upper medial right hemithorax is unchanged . Lungs are otherwise clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Unchanged mediastinal widening from known thoracic aortic aneurysm , not significantly changed in appearance compared to ___ . No focal consolidation worrisome for pneumonia .