[A Case of Stage Ⅳ Breast Cancer Treated with Mastectomy after Spontaneous Removal of a Cosmetic Breast Implant].

A 51-year-oldwoman came to our hospital complaining of a skin ulcer in the left breast. She hadpreviously undergone cosmetic breast augmentation by placement of a bag prosthesis under each mammary gland. She was diagnosed with Stage Ⅳ(T4bN1M1)breast cancer with multiple bone metastases. Following the diagnosis, 3 regimens of hormonal therapy were sequentially administered. The treatment was then switched to chemotherapy following confirmation of tumor progression in the left breast tumor. After 3 cycles of paclitaxel andbevacizumab as the second-line of chemotherapy, the size of the left breast tumor was remarkably reduced. Mastectomy with axillary lymph node sampling and removal of the implant were scheduled for local control. However, due to gradual exposure of the implant under the left breast, it was spontaneously removedfrom the original position when the patient was waiting for the surgery. Therefore, only mastectomy with axillary lymph node sampling was performed, followed by 45 Gy/25 times of postmastectomy and locoregional lymph node irradiation. Six months after the surgery, the patient is alive with no signs of local recurrence.