title: Spinal metaplastic meningioma with osseous differentiation in the ventral thoracic spinal canal.
abstract: Ossified meningioma is classified histologically as a phenotype of metaplastic meningioma, and it is extremely rare. There are only 12 cases involving ossified spinal meningiomas in the literature. We present the case of a 61-year-old female with a primary tumor within the ventral spinal canal at T12. Although we performed a total tumor excision using an ultrasonic bone aspirator, a temporary deterioration of motor evoked potentials (MEPs) was observed during curettage with a Kerrison rongeur. The neurologic findings worsened immediately after surgery. Histologically, the tumor was diagnosed as a metaplastic meningioma with osseous differentiation. In order to avoid spinal cord injury, great care must be taken when removing an ossified meningioma located on the ventral spinal cord.
authors.affiliation: Department of Orthopaedic Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558, Japan.kentaro0311@do7.enjoy.ne.jp.
authors.forename: Kentaro
authors.initials: K
authors.lastname: Yamane
authors.forename: Masato
authors.initials: M
authors.lastname: Tanaka
authors.forename: Yoshihisa
authors.initials: Y
authors.lastname: Sugimoto
authors.forename: Kouichi
authors.initials: K
authors.lastname: Ichimura
authors.forename: Toshifumi
authors.initials: T
authors.lastname: Ozaki
mesh_terms: D002454:Cell Differentiation; D019054:Evoked Potentials, Motor; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008577:Meningeal Neoplasms / Q000000981:diagnostic imaging / Q000473:pathology* / Q000628:therapy*; D008579:Meningioma / Q000000981:diagnostic imaging / Q000473:pathology* / Q000628:therapy*; D008679:Metaplasia / Q000473:pathology; D008875:Middle Aged; D013115:Spinal Canal / Q000473:pathology*; D013396:Suction / Q000379:methods; D013904:Thoracic Vertebrae / Q000473:pathology; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome; D014464:Ultrasonic Therapy / Q000379:methods