Malignant fibrous histiocytoma of the maxillary sinus.

Malignant fibrous histiocytomas are an unusual neoplasm in the head and neck, and only six cases involving the maxillary sinus have been reported. The combination of an anaplastic storiform "fibroblastic" stroma with xanthomatous tumor giant cells histologically identifies this tumor. The high incidence of local recurrence of this neoplasm necessitates wide surgical resection. Regional lymph node and distant metastases, although not previously reported in maxillary sinus fibrous histiocytomas, occurred in this case.