Yamane Kentaro, Tanaka Masato, Sugimoto Yoshihisa, Ichimura Kouichi, Ozaki Toshifumi
Department of Orthopaedic Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama 700-8558,
Acta Med Okayama. 2014;68(5):313-6. doi: 10.18926/AMO/52901.
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.
骨化性脑膜瘤在组织学上被归类为化生型脑膜瘤的一种表型，极为罕见。文献中仅有12例涉及骨化性脊髓脑膜瘤的病例。我们报告一例61岁女性，其T12水平腹侧椎管内有原发性肿瘤。尽管我们使用超声骨吸引器进行了肿瘤全切，但在使用Kerrison咬骨钳刮除肿瘤时，观察到运动诱发电位（MEP）出现暂时恶化。术后神经功能立即恶化。组织学检查显示，该肿瘤被诊断为伴有骨化生的化生型脑膜瘤。为避免脊髓损伤，在切除位于脊髓腹侧的骨化性脑膜瘤时必须格外小心。
