Metastatic invasive lobular carcinoma of the breast to the endometrium presenting with abnormal uterine bleeding; Case report.

Metastatic cancer to the female genital organs is a very rare clinical presentation. The myometrium is more frequently affected than the endometrium. Prolonged use of tamoxifen has been found to be associated with endometrial hyperplasia, endometrial polyp formation, and the development of endometrial adenocarcinoma in some cases. A 55-year-old lady with a history of invasive lobular carcinoma of the breast that had been operated upon with left mastectomy 7 years previously & who had also been treated with tamoxifen for 5 years presented with irregular vaginal bleeding and lower abdominal pain. The patient had a three cm uterine fibroid with an endometrial polyp. She had anemia with hemoglobin level 8 mg/dl. Laparoscopic hysterectomy with bilateral oophorectomy was performed for a polyp in the endometrium which proved to be a metastasis from her lobular carcinoma of the breast. Patients with breast cancer who present with abnormal vaginal bleeding should alert the physicians about the possibility of metastatic breast cancer to the uterus regardless the use of the hormonal therapy such as tamoxifen. The pathologists also should be aware of this possibility and they should examine the polyps very carefully to detect any metastatic foci especially if the patient has been treated with tamoxifen.