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FIG 3. S1 nerve root block shows the needle traversing the sacral foramen and lying directly adjacent to the S1 nerve.
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FIG 3. S1 nerve root block shows the needle traversing the sacral foramen and lying directly adjacent to the S1 nerve.
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Copyright © 2009 by the American Society of Neuroradiology. Print ISSN: 0195-6108 Online ISSN: 1936-959X