Peroneus brevis split tendon syndrome

Case contributed by Bernard Sneyers
Diagnosis almost certain


Pain at the external malleolus for several weeks.

Patient Data

Age: 45 years
Gender: Male

Partial longitudinal split tear of the peroneus brevis tendon with 'boomerang sign' on ultrasound.

Case Discussion

Peroneus brevis tendon tears can present with lateral ankle pain with or without a history of trauma, worsening with activity. Torn peroneus brevis tendons have a characteristic C-shape or "boomerang" appearance, with the tendon enveloping the peroneus longus tendon. 

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