Fig. 21
From: Traumatic and non-traumatic bone marrow edema in ankle MRI: a pictorial essay

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