An abnormal localized collection of blood in which the blood
is usua lly clotted or partially clotted and is usually situated within an organ
or a soft tissue space, such as within a muscle.
A hematoma is caused by a break in the wall of a blood vessel. The break may
be spontaneous, as in the case of an aneurysm, or caused by trauma.
The treatment of a hematoma depends on its location and size. Treatment can involve
draining the accumulated blood. A hematoma in or near the brain is particularly
dangerous.
The word "hematoma" came into usage around 1850. It was devised from Greek roots
-- hemat-, referring to the blood + -oma, from soma meaning body = a bloody body,
or a collection of blood.
The many different kinds of hematomas are defined by location and include:
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