Giant adenofibroma of the breast

Giant adenofibroma of the breast, also known as giant fibroadenoma, is a rare benign breast tumor classified under Orphanet code 180267. It is a variant of fibroadenoma — the most common benign breast neoplasm — distinguished by its unusually large size, typically exceeding 5 centimeters in diameter or weighing more than 500 grams. The tumor is composed of both glandular (epithelial) and stromal (connective tissue) components, which is characteristic of fibroadenomas. It presents as a rapidly growing, well-circumscribed, painless breast mass that can cause significant breast asymmetry, skin stretching, and prominent superficial veins over the affected breast. Giant adenofibroma predominantly affects the breast and surrounding soft tissues. It occurs most frequently in adolescent girls and young women, particularly during periods of hormonal change such as puberty or pregnancy. The mass is typically unilateral and mobile on examination. Although benign, its rapid growth and large size can cause considerable cosmetic concern and psychological distress. Importantly, it must be distinguished from phyllodes tumors, which can have a similar clinical presentation but carry a risk of malignant behavior. Diagnosis is based on clinical examination, imaging (ultrasound and/or mammography), and histopathological confirmation, usually following excisional biopsy. The standard treatment is surgical excision (enucleation or lumpectomy), which is generally curative. Breast-conserving approaches are preferred, especially in young patients, to preserve as much normal breast tissue as possible and allow for future breast development. Recurrence after complete excision is uncommon. No systemic medical therapy is typically required. Long-term prognosis is excellent, with no significant risk of malignant transformation.

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