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. 2017 Aug 1;18:329. doi: 10.1186/s12891-017-1697-8

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© The Author(s). 2017

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 — Two months later after second PELD: MR images showing down migrated disc herniation at the L3–4 (a and b). After third PELD (c), MR images showing complete removal of herniated disc and catheter of external drainage in the epidural space (d and e)