Breast Carcinoma Arising in Cystosarcoma Phyllodes: Report of a Case with a Review of the Literature

An extremely rare case of coexistent carcinoma arising in acystosarcoma phyllodes of the breast is reported. A 41-year-oldJapanese woman was referred with a lump in the right breast.A tumor measuring 5.6x3.6x3.2 cm was removed by local excision.Histological examination revealed foci of papillo-tubular carcinomawithin the benign cystosarcoma phyllodes. Radical mastectomywas performed and the axillary lymph nodes showed no metastasis.While 22 cases of coexistent carcinoma and cystosarcoma phyllodesin the same breast have been reported, in only nine of thosecases, the carcinomas including this case have developed withinthe cystosarcoma phyllodes.