Diagnoses included Pilocytic astrocytoma °1 (139 cases), Ganglioglioma °1 (36 cases), Pediatric-type diffuse low-grade glioma °2 (14 cases), Oligodendroglioma °2, IDH-mutant, 1p/19q codeleted (2 cases), Pleomorphic xanthoastrocytoma °2 (1 case), Rosette-forming glioneural tumor °1 (1 case) and Subependymal giant cell astrocytoma °1 (1 case). The gene discussed is IDH1; the disease is oligodendroglioma.