Hi,
Fibroadenomas are benign breast tumors known to increase in size and tenderness in relation to the menstrual cycles due to hormonal changes. These benign tumors are not related to breast cancer in any way.
As long as your radiologist is sure it is a fibroadenoma, there would be no need to biopsy or remove the lump, because in many cases they could go away on their own within a few years. There are some reports stating that low fat, high fiber diets, limiting caffeine intake ( coffee, chocolate, colas) could decrease incidence of fibroadenoma.
In young women your age, the tendency is not to remove fibroadenomas, unless it enlarges too much or causes considerable pain. If your radiologist is certain that the lump has all the characteristics of a benign fibroadenoma, then conservative management with regular follow ups is advisable. However, if there is any concern, a biopsy of the tumor is done to identify exactly what types of cells are there.
I consider that waiting 3 months to follow up as your first radiologist suggested is normal standard when a Fibroadenoma is not suspicious to warrant a biopsy for now.
Best wishes..
You are more than welcome,
Yes, please do update us when you get the results.
Thank you. :)