Description: If your seizure medicines are not working well and a CT scan or MRI shows that you have a tumor, an abnormal collection of blood vessels, or some other "lesion" in your brain that is a likely cause of your seizures, surgery may be a good option. The neurologist or epileptologist will refer you to a neurosurgeon, who will investigate further to plan the safest and most effective surgery for you. An important part of this planning is deciding how large an area to remove.