Abstract
A 12-year-old girl consulted a pediatric clinic with a 2-year history of a rapidly growing mass in the right breast. Physical examination revealed a firm, elastic, well-defined tumor occupying the entire right breast. On ultrasound, a well-circumscribed hypoechoic tumor containing cystic spaces was observed. Core needle biopsy revealed findings consistent with a fibroadenoma, although the possibility of a phyllodes tumor was also considered. Surgical excision of the tumor was performed. The tumor was 13 cm in diameter and weighed 540 g. Histopathologically, the tumor was diagnosed as a giant juvenile fibroadenoma. At the annual follow-up examination, there was no evidence of recurrence and normal function and appearance of the breast were maintained. Giant fibroadenomas are rare, usually occurring in girls between 10 and 18 years of age, and are characterized by massive and rapid enlargement of an encapsulated mass. They can grow to huge sizes and compress the surrounding normal breast tissue. Giant fibroadenomas are almost always benign and should be treated by breast-conserving surgery. Especially in young adult women, it is important to preserve the normal function of the breast and also consider cosmetic satisfaction.
