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Although computed tomography suggested peritoneal dissemination to the Douglas pouch, she wanted to preserve her fertility; therefore, she underwent a right salpingo\u2010oophorectomy. Histopathological diagnosis was carcinosarcoma consisting of high\u2010grade serous carcinoma and sarcomatous components, including cartilage. Three weeks later, she underwent radical surgery. The disease was classified as advanced stage IIIB (FIGO 2014). A germline <jats:italic>BRCA2<\/jats:italic> pathogenic variant was identified. After postoperative adjuvant chemotherapy, maintenance therapy with a poly(adenosine diphosphate\u2010ribose) polymerase (PARP) inhibitor was continued for 25 months without recurrence. A detailed examination of a mass in her left breast at her first visit revealed a ductal carcinoma in situ. 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