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Displacement of a normal-appearing peroneus brevis to the anterior aspect of the lateral malleolus without soft tissue swelling, indicating that it has been present for some time. Peroneus longus remains in normal position. Retinaculum also appears to be in continuity suggesting that it has healed after injury in the past. Note in addition the presence of an accessory muscle and tendon in the retinaculum ie the peroneus quartus inserting onto the calcaneum (retrocalcaneal eminence).