Massive metastasis of breast cancer to female genital organs.

Objective: Breast cancer metastasis to the female genital tract is rare, and the ovaries are the most frequent site of extragenital cancer metastasis. The uterus and cervix have been rarely reported as the site of metastasis.

Case Report: A 57-year-old woman diagnosed with invasive lobular carcinoma of the left breast 2 years prior was undergoing tamoxifen treatment. She presented with a right breast mass and postmenopausal bleeding. Synchronous right breast invasive lobular carcinoma with endometrium metastasis was diagnosed. The metastasis tumor involved the endometrium, myometrium, cervix, ovaries, and fallopian tubes.

Conclusion: We noted the rarity of massive metastasis of the female genital tract from breast cancer. Gynecological surveillance and prompt evaluation of the endometrium led to timely diagnosis and treatment.