Ecchymosis
| Ecchymoses | |
|---|---|
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| Bilateral periorbital ecchymosis, also known as "raccoon eyes". (Bruising around the eyes on both sides.) | |
| Pronunciation |
/ˌɛkᵻˈmoʊsᵻs/ e- + chym + -osis |
| Classification and external resources | |
| Specialty | Dermatology |
| ICD-9-CM | 459.89, 782.7 |
| MeSH | D004438 |
An ecchymosis is a subcutaneous spot of bleeding (from extravasation of blood) with diameter larger than 1-centimetre (0.39 in). It is similar to (and sometimes indistinguishable from) a hematoma, commonly called a bruise, though the terms are not interchangeable in careful usage. Specifically, bruises are caused by trauma whereas ecchymoses, which are the same as the spots of purpura except larger, are not necessarily caused by trauma, often being caused by pathophysiologic cell function.
A broader definition of ecchymosis is the escape of blood into the tissues from ruptured blood vessels. The term also applies to the subcutaneous discoloration resulting from seepage of blood within the contused tissue.
Hematomas can be subdivided by size. By definition, ecchymoses are 1 centimeter in size or larger, and are therefore larger than petechiae ( less than 2 millimeters in diameter) or purpura (2 millimeters to 1 centimeter in diameter). Ecchymoses also have a more diffuse border than other purpura.
There are many causes of subcutaneous hematomas including ecchymoses. Coagulopathies such as Hemophilia A may cause ecchymosis formation in children. The medication betamethasone can have the adverse effect of causing echhymosis.
The word ecchymosis (/ˌɛkᵻˈmoʊsᵻs/; plural ecchymoses, /ˌɛkᵻˈmoʊsis/) comes to English from New Latin, based on Greek ekchymōsis, from ekchymousthai "to extravasate blood", from (elided to e-) and chymos, "juice". Compare enchyma, "tissue infused with organic juice"; elaboration from chyme, the formative juice of tissues.
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