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Os trigonum syndrome. a Lateral radiograph of the ankle demonstrates an os trigonum (arrow) and posterior soft-tissue prominence and infiltration of the pre-Achilles fat (arrowheads). Sagittal T1-weighted (b) and STIR (c) MRIs show bone marrow oedema (arrows) in the os trigonum, posterior recess nodularity and thickening (arrowheads), and a joint effusion (asterisk). The patient was a runner with clinical posterior impingement
