A collection or swelling of blood in a body cavity or tissue, similar to a hematoma or blood-filled cyst.
From Greek haema (blood) + kele (hernia or swelling). Medical term adopted in the 1800s to describe pathological blood accumulations.
A haematocele is basically a pocket of blood that shouldn't be there—whether from injury or disease—and its location changes everything about how serious it is (one in your knee versus near your heart matters a lot).
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