This 11-year-old female presents with history of pelvic mass. Nonvisualization of the left ovary on ultrasound with left adnexal cystic, septated lesion measuring 15cm, on CT scan areas of calcium and fat density are demonstrated within the left upper lateral margin with left hydronephrosis and hydroureter.
In this case, there is a giant left adnexal mass predominantly cystic with marginal fatty elements. Which of the following could be a potential differential?
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