Glioma: A Common Type of Brain Tumor That can be Fatal Glioma is a common type of tumor originating in the brain, which is formed in glial cells. Glial cells are cells in the brain, which surround and support neurons in the brain including astrocytes, oligodendrocytes, and ependymal cells. Glioma can affect functioning of the brain and it can be fatal, depending on its location and severity...