Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest are compared to previous exam from ___ . The lungs are clear of focal consolidation or effusion . Cardiac silhouette is slightly enlarged . There is a lobulated soft tissue density projecting over the lateral aspect of the descending aorta , potentially arising from it and should be further characterized with CT scan . This had been seen on prior , but is more conspicuous on today 's exam .
    OUTPUT:
    
No definite acute cardiopulmonary process . Lobulated soft tissue density projecting over the lateral aspect of the descending thoracic aorta presumable an aneurysm versus less likley adjacent mass . Further characterization is suggested by CT scan .