Presentation
Incidental finding
From the case:
Os peroneum
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Incidental os peroneum is noted that should not be mistaken for an apophysis or avulsion fracture of the base of the fifth metatarsal.
Case Discussion
An os peroneum is a small accessory bone located just proximal to the base of the 5thmetatarsal and located within the substance of peroneus longus tendon as it arches around the cuboid.