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Peroneus quartus muscle

Case contributed by Roberto Schubert
Diagnosis certain

Presentation

Lateral ankle pain. No history of trauma.

Patient Data

Age: 55 years
Gender: Female
mri

There is a third myotendinous structure within the peroneus tendon sheath postero-medial to the longus and brevis tendons, that can be followed down to the retrotrochlear eminence of the calcaneus.

Case Discussion

Typical position of the peroneus quartus accessory muscle.

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