AVM and brain surgery, anyone shed some light?

My older brother who is 30 years old was diagnoised with a AVM today after having a CAT scan and a MRI and other tests. It was found because he had a seizure the other night and fell and hurt himself. He went to the ER because he thought he might need sticthes from the fall and that is when they discovered he had a seizure. So luckily they found it before it ruptured or anything. So anyway the neurosurgeon wants to do surgery to remove it. My brother is terrified, I'm terrified and my whole family is just a reck. Can anyone shed some light on this? If they remove it will that mean his risk for seizures are gone? Has anyone had brain surgery before? Thanks!!!