Primary cancers of the vagina are rare, and so vaginal tumours are likely to represent metastasis from another site. Although breast cancer is a common malignancy, it rarely gives rise to vaginal metastases. In this study, we report a case of vaginal cancer diagnosed in a 65-year-old woman. Clinical examination showed the presence of a breast tumour, and ductal breast carcinoma was diagnosed by biopsy. Analysis of the vaginal tumour suggested that it was a metastasis. It was through the detection of the secondary tumour, complete gynaecologic examination, and complementary examinations that the primary site was correctly identified.
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