All of the following are true regarding cystosarcoma phyllodes except

Ans) c (Arise from ) Ref Sabiston 18th ed pg 871Phyllodes tumor contain a biphasic proliferation of stromal & mammary epithelium.They are finn lobulated masses. Histologically whorled stroma forms larger cleft lined by epithelium that resembles clusters of leaf like structure.Mammographically rounded densities with smooth borders indistinguishable from fibroadenomas.USG may reveal a discrete structure with cystic spaces.Core biopsy gives correct diagnosis in only 50% case.So, excision biopsy is the best.Local excision of phylloids tumor is curative in benign tumors.For border line phyllodes tumor excision with 1 cm margin.For malignant phyllodes tumor- total mastectomy.