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. 2020 Aug 17;11:97. doi: 10.1186/s13244-020-00900-8

Fig. 21.

Fig. 21

A 16-year-old male with chronic posterior ankle pain and a suspected os trigonum with impingement. (1) MRI showed an os trigonum with BME, (2) effusion and synovitis, and (3) degenerative cysts (4) along the articulation with the posterior talar process