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The eruption of lava from a vent in the earth.
The pouring out or eruption of a body fluid from its proper channel or vessel into the surrounding tissue.



the accumulation of blood that has flowed out of the blood vessels into the body cavities or surrounding tissues.

Extravasation may occur when the walls of the vessels are destroyed by a mechanical injury or a pathological process (for example, tumor). It may also occur through an uninjured wall, when the permeability of the wall is increased (for example, under the influence of certain chemical substances). The discharged blood may either permeate the tissues affected by the extravasation or form a circumscribed accumulation, called a hematoma. The significance of extravasation is determined by dimensions, rapidity of development, and site of formation. When the process is minor it is resorbed without treatment. If encapsulated or suppurative, it often requires special treatment. Because extravasation may lead to the destruction of tissue, it is especially dangerous in the brain (insult).

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References in periodicals archive ?
Extravasation of contrast media occurs when iodinated contrast injected intravenously (IV) leaks out into the surrounding tissues because of the dislodgment of the intravenous cannula, leakage from the puncture site or rupture of the vascular wall.
Active extravasation of contrast, myocardial disruption, and visualized communication between the ventricle and pericardium may signal this rare imaging diagnosis.
Oral mucoceles; extravasation cysts and retention cysts.
The laceration of the liver in this case was in proximity to the gallbladder fossa and contrast extravasation here raised concern for a gallbladder injury.
As such, sensation of pain and burning in oncology patients should be considered a reliable sign of extravasation even when good blood return is observed.
Eight examinations were negative for active extravasation, two of whom showed haemorrhage in second session and were embolized.
We present a case of tracheal distortion caused by extravasation of fluid in a 73-year-old male undergoing an arthroscopic shoulder cuff repair, in which a cuff leak was useful in deciding safety of extubation.
Aside from that, a right occipital epidural hematoma and extensive subarachnoid extravasation was found, especially in the posterior cranial fossa (Figures 1, A and B, and 2).