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 mixed neuronal-glial tumors, and they can occur anywhere in the brain or spinal cord. Most mixed neuronal-glial 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. Mixed neuronal-glial tumors can occur at any age but are more common in children and young adults. Also called glioneuronal tumor.