You could take it to mean a mildly twisted aorta.
Do more research though.
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descending aorta
There are several reasons an aorta could be enlarged. Significant ones include hypertension, diseases of elastic tissue (including Marfan's syndrome), and syphilitic aortitis (due to long-standing infection with syphilis)
Arteries. Or you might mean the aorta, the large artery coming directly out of the heart with others brancing from it.
The Aorta is one of the hearts blood vessel's Have you ever seen an old water pipe that has a buildup around the inside surface of the pipe consisting of rust calcium and other rubbish which reduces its ability to let water through? well the same thing can happen with the blood vessels as a result of age diet or both.
Do you mean the "Celiac artery"? if so, its an artery that originates from the abdominal aorta just below the diaphragm and branches into the left gastric artery and the common hepatic artery and the splenic artery.