Juvenile Giant Fibroadenoma Vs. Phyllodes Tumor: Know the Difference in a 14-Years-Old Woman: Case Report

Fibroadenoma is the most common benign fibroepithelial lesion of the breast in young women, accounting for around 90% of solid lesions of the gland in adolescence. However, juvenile giant fibroadenoma is a rare breast condition that occurs in women under 18 years of age. Due to the similarity of the characteristics of juvenile giant fibroadenoma and phyllodes tumor, both lesions characterized by rapid growth, it is important to establish the differential diagnosis of both pathologies when one of them is suspected, in order to guarantee the most appropriate therapeutic attitude to follow. A 14-year-old woman with no family or personal history of interest, who consulted due to a clinical picture characterized by breast asymmetry secondary to progressive growth of the left breast of 5 months of evolution. An ultrasound-guided core needle biopsy was performed that reported giant juvenile fibroadenoma. Lumpectomy was performed. Histopathological diagnosis compatible with juvenile giant fibroadenoma of the left breast. Based on our case and on the reviewed bibliography, we recommend an early differential diagnosis, as well as an accurate one, and surgical treatment of cases of juvenile giant fibroadenoma. The surgical tactics and technique depend on the age at the time of diagnosis, the clinical and imaging characteristics of the mammary gland and the tumor, as well as the wishes of the patient in question.