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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. 4 — Femoral head OO mimicker of hip arthritis in a 19-year-old man with continuous right hip pain for 2 years despite drilling of the femoral head and an open synovial biopsy. a Pelvic radiograph demonstrates right hip osteoporosis with joint space narrowing and osteophytes (arrowheads) suggestive of chronic arthritis. Axial fat-saturated post-contrast T1-weighted MR image (b) demonstrated an OO in the posterior aspect of the femoral head (arrow)