A 58-year-old woman comes to the physician because of a 1-week history of vaginal bleeding. Menopause was 7 years ago. Examination shows a 6-cm right adnexal mass that is mobile. Ultrasonography shows a thickened endometrial stripe and a solid right ovarian mass. Endometrial biopsy shows hyperplasia. Which of the following is the most likely diagnosis?
Dysgerminoma
Endometrioma
Granulosa cell tumor
Mucinous cystadenocarcinoma
Sertoli-Leydig cell tumor
