(A, B) The paraspinous approach to the sympathetic trunk (A, B) The paraspinous approach to the sympathetic trunk. As the needle passes through the costotransverse ligament it will travel a further 1.5 cm before reaching the sympathetic trunk. (Note that a needle inserted at T3 will pass above the sympathetic ganglion, being “hidden” by the head of the rib. (Reproduced with permission of the Cleveland Clinic.) Source: Thoracic (T2-3) Ganglion Block, Atlas of Pain Medicine Procedures Citation: Diwan S, Staats PS. Atlas of Pain Medicine Procedures; 2015 Available at: https://accessanesthesiology.mhmedical.com/DownloadImage.aspx?image=/data/books/1158/diw_ch43_f003b.png&sec=78935404&BookID=1158&ChapterSecID=64178007&imagename= Accessed: October 19, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved