title: Variants of meningiomas: a review of imaging findings and clinical features.
abstract: Meningiomas are common neoplasms that frequently occur in the brain and spine. Among the 15 histological subtypes of meningiomas in the WHO classification, the incidence of meningothelial meningiomas is the highest, followed by fibrous and transitional meningiomas. These three subtypes account for approximately 80 % of all meningiomas, and thus could be regarded as typical meningiomas. For this reason, other uncommon histological subtypes may be considered as imaging variants, and diagnosis is often challenging for radiologists solely based on imaging features of typical meningiomas. In addition to the histological subtypes, meningiomas arising in atypical locations could be easily mistaken for other lesions more commonly observed in those locations. The purpose of this article is to review characteristic clinical and imaging findings of uncommon meningiomas, including histological variants and meningiomas occurring in relatively rare locations.
authors.affiliation: Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan. akrk-tky@umin.ac.jp.
authors.forename: Akira
authors.initials: A
authors.lastname: Kunimatsu
authors.affiliation: Department of Radiology, International University of Health and Welfare, Mita Hospital, Tokyo, Japan.
authors.forename: Natsuko
authors.initials: N
authors.lastname: Kunimatsu
authors.affiliation: Department of Radiology, The University of Tokyo Hospital, Tokyo, Japan.
authors.forename: Kouhei
authors.initials: K
authors.lastname: Kamiya
authors.affiliation: Department of Radiology, The University of Tokyo Hospital, Tokyo, Japan.
authors.forename: Masaki
authors.initials: M
authors.lastname: Katsura
authors.affiliation: Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.
authors.forename: Harushi
authors.initials: H
authors.lastname: Mori
authors.affiliation: Department of Radiology, Graduate School of Medicine, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8655, Japan.|International University of Health and Welfare, Otawara, Japan.
authors.forename: Kuni
authors.initials: K
authors.lastname: Ohtomo
mesh_terms: D001921:Brain / Q000000981:diagnostic imaging; D006801:Humans; D008279:Magnetic Resonance Imaging; D008577:Meningeal Neoplasms / Q000000981:diagnostic imaging*; D008578:Meninges / Q000000981:diagnostic imaging; D008579:Meningioma / Q000000981:diagnostic imaging*; D013131:Spine / Q000000981:diagnostic imaging; D014057:Tomography, X-Ray Computed
keywords: Classification; Magnetic resonance imaging; Meningioma; X-ray computed tomography