Dear boyd: Fibrooadenomas are distinct on a mammogram or ultrasound and when aspirated - no fluid comes out. A physician can generally tell whether a lump is a fibroadenoma by feeling it. As long as the doctor is sure it is a fibroadenoma, there is no need to remove the lump. In 50% of the cases fibroadenomas will go away on their own within 5 years. In others, the life of a fibroadenoma is about 15 years. In teenagers - the tendency is not to remove fibroadenomas. In middle age women, the tendency is to remove the fibroadenomas to be sure they are, in fact, fibroadenomas.
The 2 cm fibroadenoma & cyst I had in 1986 was right next to the cancerous tumor that developed later on. I don't know how long the cancerous tumor was there because it was hidden by the fibroadenoma. The breast specialist advised to leave the fibroadenoma/cyst because it would mean a scar on my breast. Who cares? It was painful! Years later (1997) it was finally removed along with the tumor. I say if it hurts get it out. & if it doesn't belong there get it out.