A 48-year-old woman has noted a small amount of irregular vaginal bleeding for the past 2 months. She has a pelvic examination that reveals no cervical lesions, and a Pap smear that shows no abnormal cells. Next, an endometrial biopsy is performed, and there is microscopic evidence for endometrial hyperplasia. An abdominal ultrasound reveals a solid right ovarian mass. Which of the following neoplasms is this woman is most likely to have?

Gynecology and obstetrics are twin subjects that deal with the female reproductive system. While obstetrics deals with pregnancy and its associated procedures and complications, gynaecology involves treating women who are not pregnant. Gynecology comprises of both medicine as well as surgical fields.