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(A) T2-weighted sagittal magnetic resonance imaging showing left L5-S1 foraminal stenosis. (B) Left L5 selective nerve root injection using a Racz catheter.
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Magnetic resonance imaging revealed severe foraminal stenosis at the left L5-S1 (Figure 1A). Through the injection of a contrast dye via the catheter, the correct position (near the left L5 nerve root) of the needle tip was confirmed (Figure 1B).