Benign breast tumour with fibrous and glandular tissue

Demographics

• The most common breast tumour in women < 35 years of age
• Peak incidence: 15–35 years

Aetiology and pathophysiology

• Unknown, but a hormonal relationship has been established (increased estrogen, e.g., during pregnancy or before menstruation, may stimulate growth - Fibroadenomas increase in size during pregnancy and revert after menopause. ProLif of stromal & epi tissue

Risk factors

• women <35
• decreased preg/births
• Hx prior lesions
• young age with first benign lesion.

Clinical features

• well-defined, mobile mass (breast mouse)
• Most commonly solitary
• Nontender