Malignant schwannoma of the medial plantar branch of the posterior tibial nerve.

Malignant schwannoma in the foot is extremely rare. The authors present a case involving the medial plantar branch of the posterior tibial nerve in a patient with neurofibromatosis, without previous history of malignant degeneration. Following full excisional biopsy, the diagnosis was made using immunohistochemical studies and electron microscopy. A review of the literature also is presented.