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. 2018 Feb 28;61(2):258–266. doi: 10.3340/jkns.2017.0188

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Copyright © 2018 The Korean Neurosurgical Society

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Fig. 1 — A : Type A-fractures of the sacral ala : A1 with bone bruise (MRI) without a visible fracture line in the CT-scan; A2 deformation of the anterior cortical bone without a cortical disruption; and A3 anterolateral rim fracture of the ala with up to 1 cm distance in the direction of the medial sacroiliac joint. B : A1 with bone bruise in MRI; A2 plasticity of the cortical bone; A3 anterolateral fracture of the ala with up to 1 cm distance in the direction of the medial sacroiliac joint (rim fracture). A1 arrow shows bone bruise; A2 arrow shows plastic deformation of the anterior cortex; A3 arrow shows compression fracture of the anteolateral rim of ala.