Peroneus brevis tear
Dorsolateral ankle pain, with occasional ankle swelling. No history of trauma.
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Peroneus brevis tendon split tear at the level of the lateral malleolus. Note the positive cashew nut/boomerang sign. Fluid signal intensity is seen between the torn parts of the peroneus brevis tendon.
Peroneus brevis tendon tears can present with lateral ankle pain with or without a history of trauma. Ultrasound or MRI is useful in the diagnosis.