A cyst or sac-like structure formed by or related to blood vessels.
Greek 'angeion' (vessel) + 'kystis' (bladder/cyst). A combining form term used in medical terminology to describe fluid-filled sacs of vascular origin.
An angiocyst is basically a balloon-like pocket that forms from blood vessel tissue—sometimes it's harmless, but doctors need to keep an eye on it because of where it forms!
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