Fibroadenomas of the Breast | American Cancer Society

A biopsy (taking out breast tissue to check it in the lab) is needed to know if a tumor is a fibroadenoma or some other problem. Most fibroadenomas look the same all over when seen under a microscope and are called simple fibroadenomas. But some fibroadenomas have other changes, too, and are called complex fibroadenomas. (Complex fibroadenomas …

https://www.cancer.org/cancer/breast-cancer/non-cancerous-breast-conditions/fibroadenomas-of-the-breast.html