Malignant schwannoma with rhabdomyoblastic and melanocytic differentiation.

This is the first case report of an unusual malignant tumor with components of malignant schwannoma, rhabdomyosarcoma, and melanoma, occurring in an adult. The tumor was observed in the left temple in a 35-year-old man without von Recklinghausen's disease. The possible derivation of this tumor from primitive neuroectodermal cells is discussed.