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. 2019 Dec 18;19:234. doi: 10.1186/s12871-019-0906-4

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© The Author(s). 2019

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. 1 — Fluoroscopic pictures showing the technique of thoracic DRG transforaminal approach: a) ipsilateral 15° oblique view with 4 RF needles at T3, 4, 5, 6 levels (black arrows point at trajectory-end-on-needles orientation), b) P-A view showing the 4 needles tips nearly at the neural foramina, c) lateral view showing the RF needles tips in the transforaminal positions after contrast injection (black arrow points at the characteristic signet ring appearance of DRG), d) P-A view showing transforaminal, epidural and intercostal spread of the contrast at the targeted levels