Immunohistochemistry showed that the astrocytic component was positive for glial fibrillary acidic protein (GFAP) (Fig. 3A), oligodendrocyte transcription factor 2 (Fig. 3B), vimentin, and S-100 but negative for isocitrate dehydrogenase 1 (IDH1), H3K27M, P53, and α-thalassemia X-linked intellectual disability (ATRX). Here, GFAP is linked to X-linked intellectual disability.