While often considered a benign neoplasm, fibroadenomas may be thought of as aberrations of normal development. Unlike neoplasms breast fibroadenomas develop from a whole lobule rather than a single cell, and like normal breast tissue they remain responsive to hormonal control. Fibroadenomas are composed of both fibrous and glandular tissue.
Fibroadenomas are common and account for 13% of all symptomatic breast lumps. They are most common in women in their second or third decade, accounting for 60% of breast lumps in this younger population.
Fibroadenomas are thought to result from an increased sensitivity to oestrogen.
Most fibroadenomas do not enlarge after diagnosis.
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