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Preprocedural imaging. All patients had preprocedural CT to detect the presence of lytic cortical erosion of the posterior wall of the vertebral body, which was dichotomized into 2 main patterns: large defect (A) and permeative erosive defect (B). All patients had preprocedural MR imaging of the spine at the target levels to detect extraosseous neoplastic epidural soft tissue, dichotomized into large and convex (C) and small and concave (D).
