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If  teenage girls and women during their early reproductive years found tumor in their breast. The first one we must think about Fibroadenoma mammae (FAM). Because Fibroadenoma is the most common breast tumor in this age. They are rarely seen in women after the age of 40 or 45. Fibroadenomas are benign solid tumors composed of stromal and epithelial elements. Clinically, they may increase in size over a period of several months. They easily palpable and may be lobulated form. 

Fibroadenomas do not have malignant potential, although neoplasia may develop in the epithelial elements within them, just as in epithelium elsewhere in the breast. Cancer in a newly discovered fibroadenoma is exceedingly rare.

On excision, fibroadenomas are well-encapsulated masses that may detach easily from surrounding breast tissue. A tissue diagnosis is required to rule out malignancy.

Fibroadenoma has two subtypes. The first one is Giant Fibroadenoma that attains an unusually large size, typically greater than 5 cm. And latter is Juvenile Fibroadenoma that occurs in adolescents and young adults and histologically is more cellular than the usual fibroadenoma. Although these lesions may display remarkably rapid growth, surgical removal is curative.