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A localized mass of blood in tissue; usually it clots and becomes encapsulated by connective tissue.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



a localized accumulation of liquid blood in tissues.

A hematoma is formed during hemorrhages if the blood does not infiltrate the tissues (such as the subcutaneous tissue, muscles, periosteum, brain, liver, and spleen) but rather separates them, forming a cavity. The primary cause of hematomas is trauma, or rupture of pathologically altered blood vessels. Small hematomas are resorbed without a trace, but an inflammatory reaction develops, with the formation of a thick capsule, around large ones. Hematomas result in swelling, ecchymosis, pain, and dysfunction of the affected organ. Treatment involves application of a pressure bandage, and treatment with cold the first day and then heat. Surgery is indicated if a liver or spleen hematoma ruptures or if the hematoma suppurates.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
When the cause is unknown, the color of the hematoma on neuroimaging study can hint towards duration of lesion.
We report a case of a ruptured subcapsular hematoma in a preterm neonate undergoing surgery for bowel obstruction.
The spontaneous spinal epidural hematoma. A study of the etiology.
Initial laboratory tests showed an INR of 8, hemoglobin of 60 g/L, serum lipase at 1050 UI/L, and C-reactive protein at 250 mg/L A CT scan showed a parietal duodenal hematoma extended from the superior flexure of the duodenum to the duodenojejunal junction and severe acute pancreatitis with glandular necrosis of the pancreatic gland and retroperitoneal fat necrosis; the modified CT severity index was 10 points.
The patient was operated with left fronto-parietal craniotomy, and subdural hematoma was evacuated.
Then, an emergent spinal magnetic resonance image was arranged, showing a long, thin, fusiform isointense epidural hemorrhage causing compression to the spinal cord in the spinal canal at the level of C6-T2 in T1-phase image, whereas the epidural hematoma was heterogeneously intense in T2-phase image [Figure 2].{Figure 1}{Figure 2}
People suffering from subdural hematoma can become confused and sleepy.
Since there was no additional neurological loss to the previous findings, surgical treatment for subdural hematoma of the patient was not considered and conservative follow-up was decided.
On unenhanced CT, IMH involving the adventitia of the pulmonary artery appears as hyperattenuating hematoma extending along the surface of the main and branch pulmonary arteries (Fig.
The effect of hematoma removal for reducing the development of brain edema in cases of putaminal hemorrhage.
Abdominal wall hematoma after laparoscopic surgery: early treatment with selective arterial transcatheter embolization.