The Largest Phyllodes Breast Tumor in The World: A Case Report

Phyllodes tumor of the breast is an uncommon fibroepithelial neoplasm constituting 0.3% to 0.5% of female breasttumors. Complete wide local excision is frequently used for treatment and risk reduction in local recurrence. This article aims to report the largest phyllodes breast tumor ever reported worldwide. We report the case of a 24-year-old Thai woman was admitted to our hospital with a massive ulcerofungating right breast mass. Her physical examination revealed a 59 cm diameter mass over her right upper body, in which most parts were infected and ulcerated. A right mastectomy was then performed after the patient had already been treated with intravenous antibiotics for infection control and when her nutrition status had improved. This was followed by Vacuum-Assisted closure of the wound, and split-thickness skin graft, which could be performed after there was a good granulation growth at the wound base. Additionally, after histopathology examination, a 59x53x26 cm malignant Phyllodes tumor with free margins, weighing 14,500 grams, in which there was around 20% tumor necrosis, 12/10 high power fields (HPFs) of Mitosis, and the unaffected nipple was observed. The patient was discharged from the hospital after 45 days, and there was no evidence of local and distant recurrence after a one-year follow-up. Phyllodes tumors are considered unusual fibroepithelial breast tumors that have various biological behaviors, in which surgical resection is a major option for treatment.