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Osteochondritis dissecans (OCD) of the medial talar dome in a 43-year-old woman. Coronal fat-suppressed proton-density-weighted magnetic resonance image demonstrates an osteochondral fragment in situ (arrow) at the medial talar dome. Note high signal intensity rim (white arrowhead) and small cyst-like changes (black arrowhead) at the interface between the fragment and parent bone; both these findings indicate in- stability in adult OCD
