Changes

| [[FibroadenomaFibroepithelial tumor]] || 7% || Proliferation of both stromal and epithelial components,.<ref group="notes">The proliferation of two histological components is called "biplasia", from ''Latin'' bis (“twice”) and -plasia (“formation”), or "biphasic proliferation"</ref> arranged into either a pericanalicular pattern (stromal proliferation around epithelial structures), or an intracanalicular pattern (stromal proliferation compressing the epithelial structures into clefts). Fibroadenomas characteristically display hypovascular stroma compared to malignant tumors.<ref name="WHO">{{cite book |editor=Tavassoli, F.A. |editor2=Devilee, P. |title=World Health Organization Classification of Tumours: Pathology & Genetics: Tumours of the breast and female genital organs |publisher=IARC Press |location=Lyon |year=2003 |isbn=978-92-832-2412-9 |url=}}</ref><ref name="POW">{{cite web|title=Breast nonmalignant, Fibroepithelial neoplasms, Fibroadenoma|url=http://www.pathologyoutlines.com/topic/breastfibroadenoma.html|accessdate=2019-11-04|author=Jaya Ruth Asirvatham, M.B.B.S., Carlos C. Diez Freire, M.D., Cansu Karakas, M.D., Belinda Lategan, M.D., Nat Pernick, M.D., Emily S. Reisenbichler, M.D., Monika Roychowdhury, M.D., Mary Ann Gimenez Sanders, M.D, Ph.D., Gary Tozbikian, M.D., Hind Warzecha, M.D. Senior Authors: Julie M. Jorns, M.D., Shahla Masood}} Revised: 31 October 2019</ref><ref name="Rosen">{{cite book |author=Rosen, PP. |title=Rosen's Breast Pathology |isbn=978-0-7817-7137-5 |edition=3rd|year=2009 }}</ref> Furthermore, the epithelial proliferation appears in a single terminal ductal unit and has duct-like spaces surrounded by a fibroblastic stroma. The basement membrane is intact.<ref name="titleFibroadenoma of the breast">{{cite web |url=http://www.pathologyatlas.ro/tumor group mainly includes fibroadenoma-breast-pathologyand phyllodes tumor.php |title=Fibroadenoma of the breast |access-date=2007-12-15 }}</ref>