Extravasation :: Extravasation (n.) The act of forcing or letting out of its proper vessels or ducts, as a fluid; effusion; as, an extravasation of blood after a rupture of the vessels..
Extravascular :: Extravascular (a.) Outside the vessels; -- said of the substance of all the tissues.
Extravascular :: Extravascular (a.) Destitute of vessels; non-vascular.