摘要: Arteriovenous malformations (AVMs) are a congenital abnormality in which the arteries and veins on surface of brain or parenchyma connect directly without capillary vessels. The lesions comprise three components − feeding arteries, nidus, replaces normal arterioles capillaries with low resistance high flow vascular bed, draining veins. Histologically, usually have thickened collagenous walls appear “arterialized.” pathological blood vessels separated by that often shows gliosis, hemosiderin deposition, foci calcification [11, 22].