Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are slightly hyperexpanded , with relative flattening of the bilateral hemidiaphragms . There is enlargement of the ascending thoracic aorta , seen best on the lateral view , compatible with known history of aortic aneurysm . The lungs are clear , with no pneumothorax , pulmonary edema , pleural effusion , or focal consolidation .
    OUTPUT:
    
Enlargement of the ascending thoracic aorta , compatible with known history of aneurysm . No pneumonia or effusion .