Extravasation

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Extravasation is the leakage of a fluid out of its contained space into the surrounding area, especially blood or blood cells from vessels. In the case of inflammation, it refers to the movement of white blood cells through the capillary wall, into the surrounding tissues. This is known as leukocyte extravasation, also called diapedesis. In the case of cancer metastasis, it refers to cancer cells exiting the capillaries and entering other tissues, where secondary tumors may form. The term is commonly used in a medical context.

More specifically, extravasation can refer to:

• Extravasation (intravenous)
• Extravasation of infusates
• Extravasation of irrigation fluid
• Extravasation of urine
• Leukocyte extravasation
• Angiopellosis (non-leukocyte cell extravastion)