A blood-filled cyst or cavity; an abnormal sac containing blood.
From Greek 'haima' (blood) + 'kystis' (bladder, cyst). Used in pathology to describe encapsulated blood collections that develop from trauma or vascular malformations.
When blood vessels leak or rupture without proper healing, the body sometimes walls off the blood in a cyst—it's like a biological containment unit that prevents spreading.
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