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What does injection iodinated contrast confirm?
Injection of iodinated contrast confirms a correct needle tip position, with the contrast surrounding the nerve root in the epineural fat.
Using a 22 gauge Quincke needle, the posterior S1 neural foramina was cannulated under fluoroscopic guidance and the depth of the needle was guided into position under a lateral projection. Injection of iodinated contrast surrounds the nerve root in the epineural fat.