Fibroadenoma is a solid non-cancerous breast lump that occurs in younger, premenopausal women. It happens most often between ages 15 and 35. But it can be found at any age in anyone who has periods. This tumour has a well-defined round or oval shape and is painless. Most fibroadenomas don't require treatment and shrink on their own. However, if you feel any lump in your breasts it must be examined by a doctor. Also, if you find a new breast lump, notice other changes in your breasts, find that a breast lump you had checked in the past has grown or changed in any way, and consult a doctor immediately.