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. 2016 Nov 19;100(1):99. doi: 10.5334/jbr-btr.1206

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Copyright: © 2016 The Author(s)

This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CC-BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See http://creativecommons.org/licenses/by/4.0/.

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Femoral ossification variant in an 8-year-old boy (A–B) versus osteochondrosis dissecans in a 13-year-old girl (C–D).

Sagittal T1-WI (A) and plain films (B) in the first patient show irregular delineation of the subchondral bone plate of the posterior third of the medial femoral condyle with spiculated borders (arrows). Sagittal T1-WI (C) and coronal FS T2-WI (D) in the second patient demonstrate a larger lesion which is located in the medial third (black arrow) of the medial femoral condyle. The lesion is surrounded by bone marrow edema (white arrow). The lateral (inner) border of the lesion extends to the intercondylar roof.