Visualase thermal laser ablation is a type of laser surgery treatment for adults and children who have epilepsy, a disorder marked by recurring seizures due to abnormal activity of nerve cells, called neurons, in the brain. Visualase uses a laser fiber and guides it towards the source of a patient's seizures through a small hole in the skull. The laser then heats and destroys the small, well-defined area of abnormal brain tissue, leaving the surrounding tissue unharmed. The entire procedure is viewed in real time on magnetic resonance imaging (MRI) to ensure safe and successful target treatment.