Desmoid tumor associated with cystosarcoma phyllodes of the breast.

A case of desmoid tumor of 17 years' duration associated with cystosarcoma phyllodes of 17 months' duration is presented. Good initial response to radiation therapy of the desmoid tumor was shown. Poor response of cytosarcoma phyllodes to radiation therapy was noted. A comparison between the similarities and differences of the two tumors is presented.