Less than ten percent of women and men experience fibroadenomas, but that percentage could increase when accounting for undetected and unreported cases. The typical age range of those affected is 20 to 25 years, but it can occur as late as one's 50s. Most cases are of a single, small lump, while about 20 percent present with multiple lumps scattered throughout the breast. In two-thirds of all cases, the masses stay the same size or decrease and disappear.
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