A 64-year-old woman comes to the physician because of vaginal bleeding for 5 days. Menopause was 14 years ago. Examination shows a 7-cm right adnexal mass that is freely mobile. Pelvic ultrasonography shows a thickened endometrial stripe and right ovarian mass. Endometrial biopsy shows complex hyperplasia. Which of the following is the most likely explanation for these findings?
Dysgerminoma
Endometrioma
Granulosa cell tumor
Mucinous cystadenocarcinoma
Sertoli-Leydig cell tumor
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