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Fig. 5B. —40-year-old man with L5 radiculopathy undergoing lumbar diskography with needle placement through safe window. Oblique radiograph of lumbar spine obtained during L4–L5 diskography, without shaded triangle, shows outer 20-gauge straight needle (straight arrow) in safe window. Arrowhead marks superior articular facet, and curved arrow marks superior endplate of lower vertebra.