title: Meningioma in the posterior fossa without dural attachment.
abstract: A 14-year-old boy presented with a very rare meningioma in the posterior cranial fossa without dural attachment. Magnetic resonance imaging revealed a 3-cm, well-circumscribed, heterogeneously enhanced, round mass without dural tail sign in the right side of the posterior fossa. Right vertebral angiography revealed very faint tumor staining supplied by the right posterior inferior cerebellar artery. Total removal of the tumor was performed. Intraoperatively, the mass exhibited no attachment to the dura mater, cerebellar parenchyma, or choroid plexus, but was firmly attached to the arachnoid tissue near the foramen of Luschka. Histological and immunohistochemical studies established the diagnosis of meningothelial meningioma (World Health Organization grade I).
authors.affiliation: Department of Neurosurgery, Iwate Medical University, Morioka, Iwate, Japan.
authors.forename: Daiya
authors.initials: D
authors.lastname: Ishigaki
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Arai
authors.forename: Masayuki
authors.initials: M
authors.lastname: Sasoh
authors.forename: Kuniaki
authors.initials: K
authors.lastname: Ogasawara
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Uesugi
authors.forename: Tamotsu
authors.initials: T
authors.lastname: Sugai
authors.forename: Shinichi
authors.initials: S
authors.lastname: Nakamura
authors.forename: Akira
authors.initials: A
authors.lastname: Ogawa
mesh_terms: D000293:Adolescent; D001099:Arachnoid / Q000098:blood supply / Q000473:pathology* / Q000601:surgery; D014408:Biomarkers, Tumor / Q000032:analysis / Q000378:metabolism; D002530:Cerebellopontine Angle / Q000473:pathology* / Q000503:physiopathology; D002531:Cerebellum / Q000098:blood supply / Q000473:pathology; D002533:Cerebral Angiography; D019299:Decompression, Surgical; D004388:Dura Mater / Q000473:pathology* / Q000601:surgery; D006801:Humans; D015192:Infratentorial Neoplasms / Q000098:blood supply / Q000473:pathology* / Q000601:surgery; D008279:Magnetic Resonance Imaging; D008297:Male; D008488:Medical Illustration; D008577:Meningeal Neoplasms / Q000098:blood supply / Q000473:pathology* / Q000601:surgery; D008579:Meningioma / Q000098:blood supply / Q000473:pathology* / Q000601:surgery; D019635:Neurosurgical Procedures; D011183:Postoperative Complications / Q000209:etiology / Q000503:physiopathology; D013346:Subarachnoid Space / Q000473:pathology / Q000601:surgery; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome; D014711:Vertebral Artery / Q000000981:diagnostic imaging / Q000473:pathology
chemical_list: D014408:Biomarkers, Tumor