# Giant Borderline Phyllodes Tumor of the Breast: A Case Report

## TL;DR

This case report describes a rare giant borderline phyllodes tumor in a 47-year-old woman, treated with surgery and reconstruction without additional therapy.

## Contribution

The novelty lies in the detailed presentation of a rare, large borderline phyllodes tumor case with long-term development and surgical management.

## Key findings

- The tumor was unusually large, measuring over 16 cm in its largest dimension.
- Histological analysis confirmed the diagnosis of borderline phyllodes tumor.
- The patient did not require adjuvant treatment following surgery.

## Abstract

Borderline phyllodes tumor is a rare and benign form of breast cancer with malignant potential. According to the World Health Organization (WHO), phyllodes tumor is classified into three categories: benign, borderline, and malignant. The treatment of phyllodes tumor is wide focal excision combined with radiotherapy and chemotherapy in certain cases. Herein, we report a 47-year-old female who presented with a giant borderline mass approximately 19.5 x 16.9 x 9.3 cm in size. From medical history, we noticed that the mass begun to develop during puberty. Wide focal excision of the tumor and immediate implant-based reconstruction with free nipple graft was performed, with the tumor specimen measuring 16.5 x 14.2 x 8.7 cm. Histological examination reported a borderline phyllodes tumor, and in this case, the patient did not undergo adjuvant treatment.