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24-year-old man, history of ankle sprain and persisting pain in the lateral and posterior aspect of the ankle. Sagittal proton density spectral attenuation inversion recovery (PD SPAIR) image. Note the hyperintense band of fluid between the os trigonum and the posterior aspect of the talus, in keeping with disruption of the synchondrosis (white arrow). Injury to the synchondrosis is one of the causes of symptomatic os trigonum
