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. 2018 Jun 4;13:136. doi: 10.1186/s13018-018-0849-3

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — a Pre-operative magnetic resonance (MR) image shows a facet-originated cyst (arrow) compressing the thecal sac sacral (S) 1 nerve root. b Epiduroscopic image shows the laser electrode inserted into the cystic mass (white arrow); the mass decreased in size (black arrow) post-surgery. c Post-operative MR image shows the decompressed cyst (arrow) and the released thecal sac and S1 nerve root