Intraspinal Ossified Meningioma Associated with Ossification of the Ligamentum Flavum at the Same Level

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The authors reported a case of intraspinal ossified meningioma which associated with ossification of the ligamentum flavum at the same level.She was 58 years old female, and consulted our clinic with complaint of intermittent claudication and numbness of both feet, at first.Degenerative spondylolisthesis of the 4th lumbar vertebra was found, and myelogrom showed complete block at this level. Then, laminectomy and P-L fusion was performed. After operation, intermittent claudication was removed, but numbness was persisting. And, about 8 months after operation, she began to complain of gait disturbance. On the roentgenogram, OPLL at C2-3, Th5-6 and OYL from Th7-8 to Th10-11 were found. Myelogram showed complete block at the level of Th10-11. So, we considered OYL was the cause of myelopathy, but operation revealed meningioma containing mature bone tissue was the cause of myelopathy. Generally, meningioma which contains bone tissue is called osteoblastic meningioma, but this condition is very rare.
西日本整形・災害外科学会の論文