Fibroadenomas are the most common benign breast tumors, occurring most frequently in young females between 15-25 years old. They represent a hyperplastic growth of the terminal ductal lobular unit and their cause is unknown. Most fibroadenomas stop growing at 2-3 cm and involute after menopause. They present as a painless, movable breast lump that can be detected on mammogram, ultrasound or biopsy. Treatment involves surgical excision of the lump, with periareolar or submammary incisions depending on the tumor type. Rarely, fibroadenomas can undergo sarcomatous change.