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. 2015 Nov 6;5(4):420. doi: 10.2484/rcr.v5i4.420

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© 2010 The Authors.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Fig. 2A, B, C — 25-year-old woman with an extraskeletal para-articular osteochondroma. Precontrast coronal T1-weighted (A), sagittal T2-weighted (B), and axial gradient-echo (C) MRI images of the right knee. There is an ovoid mass in the Hoffa’s fat pad. The mass shows iso-signal intensity to the muscle peripherally, and there is a lobulated central osseous lesion that shows similar signal intensity to the bone on T1-weighted image (arrow in A). It shows slightly heterogeneous, diffuse, high signal intensity, with the central lesion showing a low signal intensity rim on T2-weighted image (arrow in B). Axial precontrast gradient-echo (GRE) image shows iso-signal intensity of the lesion, with the central portion showing slightly lower signal intensity than the periphery (arrow in C).