A 63-year-old woman presents to your office with a history of progressive abdominal discomfort over the past five months. She reports bloating and difficult digestion with constipation. She has no urinary symptoms and denies vaginal or rectal bleeding. An abdominal ultrasound shows a large complex pelvic mass with internal multiloculation and moderate ascites. The cancer antigen 125 (CA 125) is elevated at 1023 U/mL ( < 35 U/mL). Which one of the following is the most likely diagnosis?
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