[A malignant mixed tumor of the breast]

A case of a malignant mixed tumor of the female breast is presented. The epithelial part of it showed characteristics of a benign adenoma, the mesenchymal component those of a polymorphonuclear and spindle cellular sarcoma. Pathogenesis and histogenesis of this neoplasm as well as the literature on the subject are discussed. The incidence of this tumor and of sarcomas of the breast, in general is reported.