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. 2020 Aug 13;14(4):438–444. doi: 10.31616/asj.2020.0078

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Copyright © 2020 by Korean Society of Spine Surgery

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. 4. — Reduction in size of bare window area of L5/S1 disk by position, with left common iliac vein crossing over the midline. (A) Supine position MRI and (B) lateral decubitus MRI. ASBS & ALBL, L5/S1 bare window; OSPSBS & OLPBL’, oblique angle; AS & AL, right common iliac vein; BS & BL, left common iliac vein; OS & OL, center of L5/S1 disk; PS & PL, posterior disc midpoint; MRI, magnetic resonance imaging.