Accessory ossicles are commonly noted in the foot in characteristic locations, and are important not to mistake for fractures, heterotopic ossification, or other pathology. Os intermetatarseum is a rare ossicle of the foot, but is none-the-less typical in this case, between the proximal aspect of the 1st and 2nd metatarsals. The ossicle lateral to the cuboid represents an os peroneum, which is quite commonly observed.