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Brain arteriovenous malformation (AVM). Magnetic resonance angiography (MRA) scan of the brain of a 31 year old man (front view). The image shows a right thalamic AVM (white), a congenital malformation of the blood vessels (arteries and veins) that can rupture and bleed inside of the head and cause seizures, headaches, stroke-like symptoms, and other fatal complications. MRA is a non-invasive technique to image blood vessels in the body that uses a combination of a very strong magnetic field and radiofrequency (RF) pulses to image the flowing blood.