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Without an Incision:

Percutaneous Procedures for Diagnosis & Treatment

Chapter 11
Epidurals, Nerve Root Blocks, Facet Blocks, Discograms, Ganglion Blocks
The precise cause of spine or limb pain can often be tracked down with anaesthetic injections.  Image guidance is crucial during spine injections because small differences in location of the needle tip results in tests of very different parts of the spine.