Peroneus quartus muscle

Case contributed by Bahman Rasuli
Diagnosis certain

Presentation

Ankle sprain, incidental finding

Patient Data

Age: 55 years
Gender: Female
mri

Mortise joint effusion is seen.

Abnormal intrasubstance increased fluid signal is present along the course of anterior talofibular ligament related to ATFL sprain.

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

Case Discussion

The typical position of the peroneus quartus accessory muscle.

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