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Fig. 2A —59-year-old man with sciatica. Posteroanterior (A) and lateral (B) spot radiographs obtained during extraepineural injection of transforaminal epidural steroid. Patient was in prone position, and needle tip was inserted to left L5 nerve root. Sharp interface is present between nerve root and contrast material, which is well demarcated from outer border. In this case, width of area of opacification is not uniform.