Snap Shot A 28-year-old female presents with a 2 cm lump in the upper outer quadrant of her left breast. The mass changes in size in keeping with her menstrual cycle. Introduction Several types fibroadenoma most common tumor in women < 35 benign lesion that does not progress to breast cancer size and tenderness varies with estrogen changes histology shows hypercellular stroma that encircles or compresses ducts intraductal papilloma small tumor typically beneath areola in lactiferous sinuses common cause of bloody nipple discharge histology shows proliferative glands with intact fibrovascular cores phyllodes tumor most common in post-menopausal women consists of connective tissue and cysts with "leaf-like" projections derived from stromal cells may progress to malignancy Presentation Fibroadenoma palpable as a small, mobile, well circumscribed and firm mass Intraductal papilloma serous or bloody nipple discharge Phyllodes tumor large, bulky mass Evaluation Fine needle aspiration of the mass