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Fig. 3D. —60-year-old man with lower back pain radiating to both legs. Axial CT image shows contrast material opacification of interspinous bursa extending to posterior epidural cyst (open arrow). Small opacified communicating channel is evident between cyst and interspinous bursal fluid. Resultant moderate to severe central canal stenosis is evident. Concurrent opacification of bilateral facet joint spaces (solid arrows) at L2–L3 spinal level is also visible.