title: Cisterna magna meningiomas without dural attachment: Report of two cases.
abstract: Meningiomas within the cisterna magna without dural attachment are extremely rare. To the best of our knowledge, only three cases of meningiomas within the cisterna magna have been reported in the literature. The authors present two cases of patient with the cisterna magna meningioma without dural attachment. (Case 1) A 36-year-old female presented with a 10-month history of numbness in the left hand. Magnetic resonance imaging (MRI) disclosed the presence of a contrast-enhanced tumor in the posterior fossa. A suboccipital craniectomy was performed, and the tumor located within the cisterna magna with no attachment to the dura. Diagnosis is made as clear cell meningioma. The postoperative course was uneventful, and a recurrence has not been observed for three years. (Case 2) A 58-year-old man presented with a well-circumscribed mass in the posterior fossa. At surgery, the tumor located within the cisterna magna with a connection to the right tenia. The tumor was totally removed without neurological deficits. At a 7-year follow-up, no evidence of a recurrence was observed. It is quite difficult to preoperatively diagnose as a cisterna magna meningioma without dural attachment. However, complete removal of the tumor should be achieved.
authors.affiliation: Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Japan.
authors.forename: Masaaki
authors.initials: M
authors.lastname: Kohta
authors.affiliation: Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Japan. Electronic address: takasasa@med.kobe-u.ac.jp.
authors.forename: Takashi
authors.initials: T
authors.lastname: Sasayama
authors.affiliation: Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Japan.
authors.forename: Tomoaki
authors.initials: T
authors.lastname: Nakai
authors.affiliation: Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Japan.
authors.forename: Masaaki
authors.initials: M
authors.lastname: Taniguchi
authors.affiliation: Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Nagashima
authors.affiliation: Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Japan.
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Tanaka
authors.affiliation: Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Japan.
authors.forename: Katsu
authors.initials: K
authors.lastname: Mizukawa
authors.affiliation: Department of Pathology, Kobe University Hospital, Kobe, Japan.
authors.forename: Tomoo
authors.initials: T
authors.lastname: Itoh
authors.affiliation: Department of Neurosurgery, Kobe University Graduate School of Medicine, Kobe, Japan.
authors.forename: Eiji
authors.initials: E
authors.lastname: Kohmura
mesh_terms: D000328:Adult; D002946:Cisterna Magna / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D003937:Diagnosis, Differential; D004388:Dura Mater / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007089:Image Enhancement; D008279:Magnetic Resonance Imaging; D008297:Male; D008577:Meningeal Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D008579:Meningioma / Q000000981:diagnostic imaging* / Q000473:pathology / Q000601:surgery; D008875:Middle Aged
keywords: Cisterna magna; Dural attachment; Meningioma