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A previously healthy 16-year-old girl presents with increasing abdominal distention over the past week or two. She has been eating less than usual, but her belly has continued to grow in size. She denies any sexual activity and a urine pregnancy test is negative. Labs and imaging are ordered. Her alpha-fetoprotein (AFP) level is significantly elevated. Which of the following ovarian neoplasms is most likely to be found on imaging?