Table 4.

WHO grade II adult diffuse gliomas

	Astrocytoma histology	Oligodendroglioma histology	Oligoastrocytoma or ambiguous histology
IDHmt, 1p19q-nondel, ATRX loss	Diffuse astrocytoma, IDHmt	Diffuse astrocytoma, IDHmt	Diffuse astrocytoma, IDHmt
IDHmt, 1p19q-codel, ATRX intact	Oligodendroglioma, IDHmt & 1p19q codel	Oligodendroglioma, IDHmt & 1p19q codel	Oligodendroglioma, IDHmt & 1p19q codel
IDHwt	Diffuse astrocytoma, IDHwt	Oligodendroglioma, NOS	Diffuse astrocytoma, IDHwt

IDH: isocitrate dehydrogenase.