Definition

One of a group of rare tumors that contain a mixture of nerve cells and glial cells (supporting cells) of the brain or spinal cord. There are many different types of glioneuronal tumors, and they can occur anywhere in the brain or spinal cord. Most glioneuronal tumors are not cancer and tend to grow slowly. However, they can grow and press on nearby brain tissue, which can cause seizures, a buildup of fluid and increased pressure in the brain, and other problems. Glioneuronal tumors can occur at any age but are more common in children and young adults. Also called mixed neuronal-glial tumor.