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. 2018 Nov 5;8(11):e021783. doi: 10.1136/bmjopen-2018-021783

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© Author(s) (or their employer(s)) 2018. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Transverse CT image of the coccygeal apex The tip of the needle inserted at the lower sacral point is visible in the ischiorectal fossa (adjacent to the pudendal nerve in the Alcock’s canal).