Ultrasound shows a large complex solid and cystic mass in the RT ovary, which was a mature teratoma. Pathology shows follicular glands filled with colloid interspersed throughout the tumor
Struma ovarii is a rare ovarian tumor defined by the presence of thyroid tissue comprising more than 50% of the overall mass, usually as part of a teratoma, but sometimes as part of a serous or mucinous cystadenoma. They make up approximately 1% of ovarian tumors. They are benign about 2/3 ‘s of the time. Thyrotoxicosis is seen in 5%. Surgical resection is the treatment.
Yoo SC, Chang KH, Lyu MO, Chang SJ, Ryu HS, Kim HS. Clinical characteristics of struma ovarii. J Gynecol Oncol. Jun 2008;19(2):135-8.
