Abnormal bulges or weak spots in blood vessel walls that can rupture and cause serious bleeding.
From Greek 'aneurysma,' meaning 'a widening,' derived from 'ana-' (up) + 'eurys' (wide). Medical texts adopted this term to describe the pathological widening of arteries.
An aneurysm is like a weak spot in a tire that slowly bulges outward—the body tries to reinforce it, but sometimes it just ruptures suddenly, which is why doctors screen for them even when they're causing no symptoms!
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