A case of fallopian tube cancer was intraoperatively diagnosed in a patient submitted to laparoscopic hysterectomy and bilateral salpingo-oophorectomy because of an ultrasound diagnosis of a probable endometriotic cyst of the right ovary. Postoperatively a complete staging was performed and a synchronous carcinoma of the breast was diagnosed. Consequently the patient completed laparotomic debulking and a left mastectomy. A case of a premenopausal woman with fallopian tube cancer and synchronous breast cancer is reported together with a review of the most recent literature.