Cystosarcomaphyllodes/serocystic disease of Brodie constitutes only 0.3-0.9% of all breast tumors and only 3-6% of that are malignant.It usually occurs in women over the age of 40 years.We present a case of 45 year old female presented with swelling of left breast for 8 months with no pain or nipple discharge. On examination Left breast was grossly enlarged and distorted .Nipple areolar complex displaced with dilated veins noted with no chest wall or skin fixity.No axillary

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... sonogram breast showedIlldefined lobulated iso hypoechoic-entire breast with increased vascularity and internal cystic areas. FNAC showed features of Fibroadenoma. Patient underwent simple mastectomy along with excision of pectoral fascia. Post op HistoPathological Examination(HPE) report was MALIGNANT PHYLLOIDES TUMOR with margins free.Patient was followed up with radiotherapy after suture removal on 10 th PostOperativeDay .This malignant phylloides case is reported for its rarity and difficulty in preoperative diagnosis.