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A redrawn from Boriani S, Weinstein JN, Biagini R: Primary bone tumors of the spine: terminology and surgical staging, Spine 22:1036, 1997. B redrawn from Chan P, Boriani S, Fourney DR, et al: An assessment of the reliability of the Enneking and Weinstein-Boriani-Biagini classifications for staging of primary spinal tumors by the Spine Oncology Study Group, Spine 34:384, 2009.
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