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Angiography is a specialized type of x-ray where a contrast agent (or dye) is injected into the blood vessels, during which many x-rays are taken and used to generate a 3D image of the blood vessels examined. A brain AVM (arterial venous malformation) is a congenital abnormality of the blood vessels. Normally there are arteries, veins and capillaries. In an AVM there is no capillary bed. Instead there is a comglomeration of abnormal blood vessels which are neither normal arteries or veins. An AVM in the brain can be serious, causing headaches or stroke-like symptoms.
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