Phyllodes tumors are rare fibroepithelial lesions of the breast. They can be seen at any age, but they are most commonly found in women aged 35-55. They make up less than 1% of all breast tumors. They are classified into three groups: benign, borderline, and malignant, with the malignant group accounting for 25% and having a poor prognosis. Clinically, they appear as a benign mass in the breast and usually grow rapidly. In some patients, the lesion may present as sudden growth after many years. Phyllodes tumors can typically be distinguished from fibroadenomas histologically, usually by increased stromal cellularity and mitotic activity. Regardless of the grade of the phyllodes tumor, surgical intervention is essential for the primary treatment. Local excision, extended local excision, or mastectomy may be performed. Preoperative diagnosis is very important for proper surgical planning. In these tumors, the risk of malignancy increases as the size of the mass increases.
