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. 2020 Jun 19;49(11):1709–1718. doi: 10.1007/s00256-020-03515-8

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Almost normal CT appearance in a case of femoral neck OO in a 32-year-old man. Transverse CT image (a) shows minor cortical irregularities of the femoral neck (open arrow). 3D surface image (b) shows a bump in the head-neck junction (open arrow) suggestive of a femoroacetabular impingement syndrome. After surgical resection of that area, a typical nidus was found at microscopic examination within the resected fragment (not shown). A posteriori, a typical OO nidus can be seen on CT image after optimization of window width and level (arrow in c)