Extravasation refers to the leakage of a flui out of its container. In the case of inflammation, it refers to the movement of white blood cells from the capillaries to the tissues surrounding them. In the case of malignant cancer metastasis it refers to cancer cells exiting the capillaries and entering organs. It is frequently used in medical contexts, either referring to urine, or to blood. In some languages (e.g. German), extravasation is called "paravasation".