A swelling composed of blood that has escaped from an injured, diseased, or abnormally fragile blood vessel into tissues--in other words, a bruise. The vast majority of hematomas subside in their own time, usually about a week, without need for treatment, changing color from purple to brown to green-yellow. Internal hematomas may follow severe injury; the effects depend on the site of the hematoma. After head injuries hematomas may occur over the surface of the brain or within its substance. Injury-induced hematoma of the lung or kidney can occur also.

Hem`a*to"ma (?), n. [NL. See Hema-, and -oma.] Med.

A circumscribed swelling produced by an effusion of blood beneath the skin.

 

© Webster 1913.

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