Relating to or affecting the adventitia, the outer connective tissue layer of blood vessels and organs.
From 'adventitia' (the anatomical structure) plus the suffix '-al' (relating to). Used in medical and anatomical terminology since the 1800s.
When doctors see 'adventitial fibrosis' (scarring of the outer vessel layer) on imaging, they know there's chronic inflammation—it's a sign the blood vessel has been under stress for a long time.
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