Peroneus brevis tendon tear - boomerang sign

Case contributed by Henry Knipe
Diagnosis almost certain

Presentation

Lateral ankle pain.

Patient Data

Age: 50 years
Gender: Female
This study is a stack
Sagittal
PD fat sat
This study is a stack
Axial
T1
This study is a stack
Axial PD
fat sat
This study is a stack
Coronal T2
fat sat
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Info

Longitudinal split tear of peroneus brevis in the retromalleolar groove, which is wrapped partially around an intact peroneus longus tendon (boomerang sign). Small peroneal tendon sheath effusion. Incidental peroneus quartus. 

Case Discussion

Peroneus brevis tendon tears can be acute or chronic, and may be asymptomatic or associated with lateral ankle pain and/or instability.

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