Peroneum bone but not a cuboid fracture

¹Service d´Imagerie Médicale, Centre Hospitalier National Universitaire de Fann, Dakar, Senegal

^&Corresponding author
Ibrahima Niang, Service d´Imagerie Médicale, Centre Hospitalier National Universitaire de Fann, Dakar, Senegal

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We here report a 76-year-old patient who suffered a trauma to the right foot following an accident in the highway where a motorcycle allegedly rolled over his foot. He consults in the emergency room where an x-ray of the right foot was requested. The emergency physician saw a “bone fragment” next to the cuboid, found to have a displaced fracture of the cuboid bone. But taking the advice of the radiologist, the diagnosis was rectified because this “bone fragment” was nothing more or less than a peroneum bone which is a sesamoid bone of ovoid appearance, corticalized which when it is present sits on the lateral part of cuboid (A,B). Furthermore, there was no identified traumatic injury on the right foot. In this case, the teaching point is that even if the peroneum bone is one of the most uncommon supernumerary bones, its existence should not be ignored to avoid overdiagnosis. It is also important to know that these sesamoid bones can be the site of intrinsic traumatic lesions.

Figure 1: X-ray of the right foot. A (front view) B (profile view) showing the peroneum bone (white arrow) in the lateral part of the cuboid