A localized collection of blood outside blood vessels, usually clotted, that forms a swelling or mass. Can occur anywhere in the body and ranges from minor bruises to life-threatening brain bleeds.
From Greek 'haima' (blood) + '-oma' (mass, tumor). The term was coined in the 19th century as medical understanding of blood vessel injuries advanced. The '-oma' suffix typically indicates a mass or growth, making hematoma literally mean 'blood mass.'
A hematoma is basically blood that's lost its way and ended up where it doesn't belong! Unlike a bruise that spreads through tissues, a hematoma forms a distinct collection that can put pressure on surrounding structures - think of it as an internal blood blister.
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