Malignant fibrous histiocytoma in the maxillary sinus. Xanthoma-like change of the tumor after radiotherapy.

A case of malignant fibrous histiocytoma (MFH) in the right maxillary sinus is reported. Patient was a 30-year-old male, and was diagnosed as pleomorphic type of MFH by biopsy before therapy. The tumor shrunk and changed into xanthoma-like tumor after radiotherapy. A case like the present case has not been reported previously in the literature.