A rare case of ovarian carcinosarcoma with neuroendocrine differentiation.

A 60-year-old woman presented with worsening right lower extremity swelling for 2 days. The patient had no history of trauma or prolonged immobilization and denied further symptoms, including lower extremity pain, fever, dyspnea, chest pain, and abdominal pain. The patient's medical history included chronic hepatitis C secondary to intravenous drug use, a history of deep venous thrombosis 25 years prior to her presentation, and a history of right-sided breast cancer 20 years prior to that was treated with lumpectomy, radiation therapy, chemotherapy, and tamoxifen (discontinued by the patient after 3 years). The family history was unknown as the patient was adopted.