A primary or metastatic malignant neoplasm involving the vagina. Representative examples include carcinomas and sarcomas. The disease is vaginal cancer (MONDO_0001402). Also known as: cancer of vagina, malignant neoplasm of the vagina, malignant neoplasm of vagina, malignant tumor of the vagina, malignant tumor of vagina, malignant tumour of the vagina, malignant tumour of vagina, malignant vagina neoplasm.