Glioma is a generalized term for any tumor that develops from the glia, the supportive structure that help keep the neurons of the brain in place. There  are three types of glial cells: astrocytes (including gliobastomas), oligodendrocytes, and ependyomas. Names that refer to such tumors such as brain cell glioma are derived from the location of the tumor itself, not the type of tissue cell that gave rise to them. A specific diagnosis is only possible if a biopsy of the tumor is obtained.