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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.
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 It might be outdated or ideologically biased.



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).

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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They classified Type A as heterogeneity in contrast agent involvement, Type B as disruption in renal artery branches, Type C as moderate contrast agent extravasation, and Type D as complete obstruction in the renal artery.
History has shown that the use of metal needles for cannulation has contributed to extravasation of the vessel, thrombus, aneurysm, pseudoaneurysm and stenosis formation and also patient anxiety when starting haemodialysis, particularly related to the pain of needle insertion (Lee Barker & Allon, 2006; Marticorena & Donnelly, 2016; van Loon et al., 2009).
When power injection of contrast during a Computer Tomography (CT) scan goes wrong, extravasation of contrast media occurs.
IV therapy: recognizing the differences between infiltration and extravasation. British Journal of Nursing 2008; 17(14):896-901.
Schamberg's purpura may resemble stasis dermatitis, because both processes include inflammation, dilation of capillaries, extravasation of erythrocytes, and hemosiderin deposits.
MEDRAD recently introduced the XDS Extravasation Detector, an accessory that works with the Stellant CT Injection System.
A related term, extravasation, is defined as the unplanned administration of a vesicant solution or medication into surrounding tissue (Intravenous Nurses Society, 1998a,b).
Extravasations are leaks of potentially harmful infusates such as chemotherapy medications.
Conventional angiography revealed free extravasation of contrast from the EIA.
Both the IRiSCT and EmpowerMR systems track extravasations with the Extravasation Detection Accessory (EDA).
The lesions encountered included 16 post-traumatic extravasations, 10 pseudo-aneurysms, 12 arteriovenous fistulas (AVFs), 6 AVFs and false aneurysms occurring together, and 2 cases of abnormal vascularity (hyperemia).
Apricus acquired the rights to Topotarget's Totect, intended for treatment for chemotherapy-induced extravasations, in North and South America, as well as all North and South American assets of Totect.