Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs appear well expanded and clear . There is no pleural effusion or pneumothorax . The heart itself is normal in size , with a focal bulge just distal to the aortic arch , which is slightly increased from the previous examination in ___ .
    OUTPUT:
    
Abnormal contour of the descending thoracic aorta , slightly increased from the previous examination , which may reflect a thoracic aortic aneurysm vs acute on chronic dissecting aneurysm . Evaluation by CT is recommended . Findings were discussed with Dr . ___ by Dr . ___ at ___ by phone .