A Krukenberg tumor metastasizes from the to the ovaries.
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A 50-year-old woman, gravida 4, para 4, comes to the office because of abdominal distention and progressively worsening pelvic pain. She also reports poor appetite. She has hypertension and hyperlipidemia. She has never been diagnosed with a sexually transmitted disease. Abdominal and pelvic ultrasound shows a mass in the left ovary. The tumor is excised and pathologic examination shows abundance of mucin-secreting cells with peripheral nuclei. This tumor arises from which of the following cell types?