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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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Mucoid degeneration of the anterior cruciate ligament (ACL).

On sagittal T1-WI (A), the ACL is of intermediate signal intensity and the ligamentous structure has disappeared. On sagittal FS T2-WI (B), the ACL has a striated pattern with interspersed intact ligamentous fibers, resembling a celery stalk (white arrow). There is also an intraosseous ganglion cyst at the tibial insertion of the ACL (black arrowhead). Axial FS T2-WI (C) demonstrates the intermediate signal of the ACL with interspersed intact ligamentous fibers (black arrow).