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. 2017 Nov 16;13:340. doi: 10.1186/s12917-017-1258-2

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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. 2 — Study measurements and observations a: Transverse T2-weighted image of spinal cord at C3/C4. Using Efilm ™ the transverse spinal cord is divided into quadrants (red lines) by first placing a vertical line bisecting the spinous process and then placing the horizontal line to bisect the spinal cord and the vertical line at 90°. The perpendicular diameters of the syrinx in each dorsal quadrant are measured (blue lines – 0.4 × 0.4 cm; green lines 0.3 cm × 0.2 cm). b: Transverse T2-weighted image of spinal cord at C1. The green arrow illustrates a syrinx which extends to the area of the SDH. c: Midsagittal T2-weighted spinal cord with SM. White dotted line indicates the transverse section at C3/C4 for 3a