OCAD MSK

History

Incidental finding in an ankle MRI

Figure 1 for case accessory peroneus — Figure 1

Figure 2 for case accessory peroneus — Figure 2

Figure 3 for case accessory peroneus — Figure 3

Figure 4 for case accessory peroneus — Figure 4

Figure 5 for case accessory peroneus — Figure 5

Discussion

This muscle arises from the peroneus brevis tendon in the foot and inserts lateral to the peroneus brevis tendon onto the 5th metatarsal base. I cannot find this variant reported. A peroneus digiti minimi should insert onto the small toe. Not sure if this is a peroneus accessorius...have seen that name without illustration. Does anyone know? Note: slide 3 shows no accessory peroneus at the level of the ankle. Slide 5 in oblique coronal shows the accessory muscle along the cranial surface of the normal peroneus brevis tendon in the midfoot. Reference article.

Diagnosis

accessory peroneus

Hilary Umans, MD

Courtesy

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