title: Polar spongioblastoma: A high-grade glioma that does not contain the IDH1 mutation or 1p/19q LOH.
abstract: We report a case of an unusual glioma termed "primitive polar spongioblastoma" that displayed characteristic palisading tumor cells at the light microscopic level. The patient was a 52-year-old woman who underwent subtotal removal for a left frontotemporal tumor. The palisading pattern was present throughout the tumor. Several glial markers were revealed by immunohistochemical examination, but no neuronal markers were observed. Genetic studies showed O-6-methylguanine-DNA methyltransferase (MGMT) methylation, wild type IDH1, and the absence of 1p/19q loss of heterozygosity (LOH) in the tumor genes. Based on histological and genetic features, this tumor might not be suited to any of neuroepithelial tumor in the recent WHO classification. We consider that cases such as this should be temporarily set under a separate heading and be entrusted to future investigation after more cases have been accumulated.
authors.affiliation: Department of Human Pathology, Gunma University Graduate School of Medicine, Gunma,Department of Neurosurgery, Koshigaya hospital Dokkyo University School of Medicine, Saitama andDepartment of Neurosurgery, Dokkyo University School of Medicine, Tochigi, Japan.
authors.forename: Masaya
authors.initials: M
authors.lastname: Nagaishi
authors.affiliation: Department of Human Pathology, Gunma University Graduate School of Medicine, Gunma,Department of Neurosurgery, Koshigaya hospital Dokkyo University School of Medicine, Saitama andDepartment of Neurosurgery, Dokkyo University School of Medicine, Tochigi, Japan.
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Tanaka
authors.affiliation: Department of Human Pathology, Gunma University Graduate School of Medicine, Gunma,Department of Neurosurgery, Koshigaya hospital Dokkyo University School of Medicine, Saitama andDepartment of Neurosurgery, Dokkyo University School of Medicine, Tochigi, Japan.
authors.forename: Kensho
authors.initials: K
authors.lastname: Iwatate
authors.affiliation: Department of Human Pathology, Gunma University Graduate School of Medicine, Gunma,Department of Neurosurgery, Koshigaya hospital Dokkyo University School of Medicine, Saitama andDepartment of Neurosurgery, Dokkyo University School of Medicine, Tochigi, Japan.
authors.forename: Hideaki
authors.initials: H
authors.lastname: Yokoo
authors.affiliation: Department of Human Pathology, Gunma University Graduate School of Medicine, Gunma,Department of Neurosurgery, Koshigaya hospital Dokkyo University School of Medicine, Saitama andDepartment of Neurosurgery, Dokkyo University School of Medicine, Tochigi, Japan.
authors.forename: Keisuke
authors.initials: K
authors.lastname: Ueki
authors.affiliation: Department of Human Pathology, Gunma University Graduate School of Medicine, Gunma,Department of Neurosurgery, Koshigaya hospital Dokkyo University School of Medicine, Saitama andDepartment of Neurosurgery, Dokkyo University School of Medicine, Tochigi, Japan.
authors.forename: Akio
authors.initials: A
authors.lastname: Hyodo
authors.affiliation: Department of Human Pathology, Gunma University Graduate School of Medicine, Gunma,Department of Neurosurgery, Koshigaya hospital Dokkyo University School of Medicine, Saitama andDepartment of Neurosurgery, Dokkyo University School of Medicine, Tochigi, Japan.
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Nakazato
mesh_terms: D000293:Adolescent; D001932:Brain Neoplasms / Q000235:genetics* / Q000473:pathology; D002648:Child; D002878:Chromosomes, Human, Pair 1; D002888:Chromosomes, Human, Pair 19; D019175:DNA Methylation; D015254:DNA Modification Methylases; D045643:DNA Repair Enzymes; D005260:Female; D005910:Glioma / Q000235:genetics* / Q000473:pathology; D006801:Humans; D007223:Infant; D007521:Isocitrate Dehydrogenase / Q000235:genetics*; D019656:Loss of Heterozygosity; D008297:Male; D008875:Middle Aged; D018302:Neoplasms, Neuroepithelial / Q000235:genetics* / Q000473:pathology; D025521:Tumor Suppressor Proteins
chemical_list: D025521:Tumor Suppressor Proteins; D007521:Isocitrate Dehydrogenase; C543588:IDH1 protein, human; D015254:DNA Modification Methylases; C515491:MGMT protein, human; D045643:DNA Repair Enzymes