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embolization (therapeutic embolization) (em-bol-I-zay-shŏn) n. the introduction of occluding material, such as microspheres, into an artery in order to reduce or obstruct blood flow in such conditions as congenital arteriovenous malformations, angiodysplasia, malignant tumours, or arterial rupture. uterine artery e. embolization of the uterine artery for the treatment of postpartum haemorrhage and fibroids and to terminate abdominal and cervical pregnancies.