A Case of Painful Os Styloideum in the Midfoot (Tarsal Boss).

A case of symptomatic bone fragment without trauma in the midfoot at the dorsal aspect between first and second tarsometatarsal joints is presented. Such fragment is a common finding in the wrist, referred to in the literature as an os styloideum or carpal boss; however, it has not yet been described in a similar location in the midfoot.