Phyllodes tumor

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Phyllodes tumor

Reproductive system and breast

Key Takeaways

A phyllodes tumor is a fibroadenoma-like tumor characterized by an overgrowth of the fibrous component of the breast. These tumors are typically large, fast-growing masses that form from the periductal stromal cells of the breast. A phyllodes tumor appears as a lump in the breast and may be associated with breast pain and nipple discharge. These tumors account for less than 1% of all breast neoplasms and are commonly seen in postmenopausal women. They can be malignant in some cases.