Phyllodes tumors are fibroepithelial neoplasms of the breast accounting of about 0.3- 0.9% of all breast tumors. They can be classified as benign, borderline or malignant according to World Health Organization with benign tumors comprising 54-85% of all cases. A 20 year old female presented with a right breast lump since 3 months. On physical examination lump was in the lower inner quadrant of right breast. Ultrasonography revealed a heterogeneous, lobulated mass. On Fine- needle aspiration cytology, a diagnosis of atypical cytology, breast (C3) was given. The patient underwent a right sided simple mastectomy. The specimen was sent for histopathological examination and a diagnosis of malignant phyllodes tumor with sarcomatous transformation was rendered. As considering about the rarity of this tumor a possibility should always be kept in mind in tumors of breast having similar characteristics so as to help in the early management of the patient.
