Malignant fibrous histiocytoma. Report of a case and review of the literature.

Malignant Fibrous Histiocytoma is a sarcoma characterized by two different principal cell types, which has its origin in mesenchymal undifferentiated clones. So it must be included in the differential diagnosis of the very rare primary breast tumors with stromal origin. The review of available literature allows us to define the histopathological and biological peculiarities of this kind of tumor and it confirms the extreme malignity and rarity of the case we observed.