Fibrocartilaginous mesenchymoma of the bone is an extremely rare, locally aggressive tumor which is most often found in the long bones of younger patients. Only about 36 cases have been described in the world literature since 1984. Here, we report a rare clinical case of fibrocartilaginous mesenchymoma of the bone in a 13-year-old child. The patient's parents gave consent to the use of their child's data, including photographs, for research purposes and in publications.