MD here. Something is odd. If it's big enough to be tumor-like it's big enough to be biopsied. If it's small, they can just watch it on serial CT scans. If it'

MD here. Something is odd. If it's big enough to be tumor-like it's big enough to be biopsied. If it's small, they can just watch it on serial CT scans. If it's growing, they can put her on bypass and replace that section of her aorta. Not as easy as it sounds, but still usually possible. Repair with stem cells is very different than curing a tumor. In complex, atypical cases the answer is always to go to a large teaching institution.