Dermatofibrosarcoma protuberans of the sole

A 42-year-old Chinese man presented with a dome-shaped, red, tender, bony-hard tumor on his right sole. Histological examination revealed tumor nests which consisted mainly of fibroblast-like cells with large, spindle-shaped nuclei and histiocyte-like cells extending from the upper dermis to the subcutaneous tissue. The tumor cells showed both a storiform and a cartwheel pattern. The location of a dermatofibrosarcoma protuberans on the plantar aspect of the foot is exceptional.