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This article reports a rare case of cancer derived from ovarian remnant tissue. A 52-year-old woman, with a history of a total hysterectomy and bilateral salpingo-oophorectomy for uterine myomas and endometriosis 13 years ago, presented with a pelvic mass accompanied by high serum levels of CA125 and CA199. Exploratory laparotomy and pathology report revealed an ovarian serous tumor with low malignant potential. Cancer derived from ovarian remnant tissue is extremely rare. However, a malignancy may still originate from the ovarian remnant. Ovarian remnant syndrome after oophorectomy and its possibility of malignancy, especially in case of endometriosis, should not be neglected.