AbstractBreast cancer is one of the most common malignancies in women. However, cases of vaginal metastases of breast cancer are rarely reported in China and abroad. The main clinical symptom of vaginal metastases of breast cancer is vaginal bleeding. This article aims to provide a reference for the diagnosis and clinical management of vaginal metastases from breast cancer. This article describes in detail the management of a 50-year-old woman with vaginal metastases from breast cancer, who was admitted to the hospital with persistent vaginal bleeding without apparent causes. Persistent vaginal bleeding was found after two and a half years when her breast cancer surgery was performed. After comprehensive evaluation, vaginal mass resection was performed. Postoperative histopathology confirmed that the vaginal mass was breast cancer metastasis. The patient was treated with local radiotherapy and three cycles of eribulin and bevacizumab after the vaginal mass was removed. A reexamination of computed tomography showed that the chest wall metastases were less extensive than before. Orbital metastases were also reduced in size, which was revealed by the physical examination. The patient had since failed to return to hospital on time for a regular treatment due to personal reasons. After 9 months of follow-up, the patient died of multiple metastases. The diagnosis of vaginal masses is based on pathological examination, and systemic treatment should be the mainstay when extensive metastases are presented.