Posterior ankle impingement (os trigonum) syndrome
Posteromedial ankle pain in a swimmer.
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An os trigonum is seen with alteration of its marrow signal, being of low T1 and high T2 / STIR (bone marrow edema / contusion), as well as surrounding soft tissue edema signal. Similar marrow signal changes are seen within the posterior talar aspect. Mild amount of tibio-talar and sub-talar joint effusion is noted.
In light of patient's history, the above described changes are suggestive of posterior ankle impingement (os trigonum) syndrome with tibio-talar and sub-talar joint effusion.