title: A case of primary extracranial meningioma of the forearm with bone invasion.
abstract: We report here a rare case of primary extracranial meningioma in a 73-year-old woman with an asymptomatic mass located in the left distal-dorsal forearm. MRI revealed the lesion to be poorly circumscribed and unclear, with iso-signal intensity to muscle on T1 and with a relatively high signal intensity on T2-weighted imaging. The histopathology of the specimen from incision biopsy was typical of meningioma, showing bland spindle cell proliferation with a whorling pattern. Immunohistochemically, the tumor cells were positive for epithelial membrane antigen and vimentin, and negative for S-100 expression.
authors.affiliation: Division of Orthopaedic Surgery, Self-Defense Force Fuji Hospital, 481-27 Subashiri, Oyama-cho, Sunto-gun, Shizuoka, 410-1431, Japan. hm.lucky@k6.dion.ne.jp
authors.forename: Hideki
authors.initials: H
authors.lastname: Murata
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Takahashi
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Takagi
authors.forename: Hirohisa
authors.initials: H
authors.lastname: Katagiri
authors.forename: Ichiro
authors.initials: I
authors.lastname: Ito
authors.forename: Tsuyoshi
authors.initials: T
authors.lastname: Ishida
mesh_terms: D000368:Aged; D001859:Bone Neoplasms / Q000175:diagnosis*; D003287:Contrast Media; D003937:Diagnosis, Differential; D005260:Female; D005542:Forearm; D019786:Gadolinium DTPA; D006801:Humans; D007150:Immunohistochemistry; D008279:Magnetic Resonance Imaging; D008579:Meningioma / Q000175:diagnosis*; D011884:Radius / Q000473:pathology
chemical_list: D003287:Contrast Media; D019786:Gadolinium DTPA