Malignant fibrous histiocytoma of the maxillary sinus.

A rare localization of a malignant fibrous histiocytoma is presented. Review of the literature showed that the biological behavior of this group of tumors is obscure. The histomorphologic pattern does not always reflect the malignant character, the tendency for recurrence, and the metastasizing potential of the individual tumor. Radiotherapy is ineffective, so the surgeon must opt for radical excision. Additional clinical reports, long-term follow-up, and electron microscopic studies are needed to establish the biological behavior of this group of tumors.