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. 2015 May 10;10:62. doi: 10.1186/s13018-015-0204-x

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© Li et al.; licensee BioMed Central. 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. 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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CT and MR images showing bone union of grade I. (A) CT image showing S1 bone destruction, presacral cold abscess, and sequestrum. (B) MRI showing L5–S1 vertebral signal change, narrowed intervertebral space, and presacral cold abscess.