A case of cystosarcoma phyllodes harboring intraductal carcinoma, in a 40 year old woman, is presented. The stromal compoment of the neoplasm was diagnosed as a low grade malignant phyllodes tumor. The transformation of the epipthelium was parallel ranged from atypical hyperplasia to ductal carcinoma in situ. In the setting of a cystosarcoma phyllodes this malignant epithelial change, especially in the form of intraductal carcinoma, is a very rare event. Due to lack of experience regarding the management of these combined lesions, it is proposed that the treatment should be individualised.

Key words: Breast, Intraductal carcinoma, Cystosarcoma phyllodes.

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