Cysteosarcoma phylloides (CP) constitutes a rare form of breast neoplasia, which represents less than 1% of total breast neoplasias and only 2,3% of all fibro-epithelial breast tumors.It is termed "cystosarcoma phylloides" because of the extensions of the tumor mimicking the shape of leaves, intruding within the cystic cavities of the tumor. Phyllodes tumours of the breast are characterized by having both an epithelial as well as stromal component and these usually comprise almost 3% of all fibroepithelial tumours. They are exceptional in this aspect to convert into a stromal sarcoma of the breast after multiple recurrences. The stromal component of phyllodes tumor has the potential to undergo metaplasia to cartilage, bone, smooth muscle and striated muscle as well as their respective malignant neoplasms. The liposarcomatous differentiation of the stromal elements of phyllodes tumor is extremely rare. The recurrence rate is 1 6-28% after mastectomy or wide-wedge resection and 28- 46% after simple enucleation of the tumor. The tumor metastasizes via the vascular route; about two thirds of metastases are to the lungs, fewer are to the bone, liver, and myocardium. Phylloides tumor occurs mostly in women in their fifth or sixth decade, and occasionally in women younger than 20 years old.