Posted in Web Fibroadenoma: Symptoms, Causes, Diagnosis, and Treatment January 23, 2021 A fibroadenoma is a benign, or noncancerous, breast tumor. Unlike a breast cancer, which grows larger over time and can spread to other organs, a fibroadenoma remains in the breast tissue. https://www.webmd.com/breast-cancer/what-are-fibroadenomas