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. 2022 Sep 7;24(Suppl 1):S81–S94. doi: 10.1093/pm/pnac130

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© The Author(s) 2022. Published by Oxford University Press on behalf of the American Academy of Pain Medicine.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 6. — Spinal canal stenosis. Normal configuration and diameter of the spinal canal (a) and severely narrowed spinal canal with complete loss of cerebrospinal fluid (CSF) signal due to degenerative changes with a synovial cyst (b; arrowhead).