Struma ovaril is composed entirely of: (A) Mature thyroid tissue, (B) Immature thyroid tissue, (C) Pimary ovarian carcinoid tissue, (D) None of the above
Answer is A. Struma ovarii is a monodermal or specialised teratoma. They are germ cell tumours of ovary. Struma ovarii is composed entirely of mature thyroid tissue ,which may be functional and causes hypehyroidism. Struma ovarii is a rare ovarian tumor that was first described in 1899. It is defined by the presence of thyroid tissue comprising more than 50% of the overall mass. It most commonly occurs as pa of a teratoma, but may occasionally be encountered with serous or mucinous cystadenomas (Ref : ROBBINS Text book of pathology) REF IMG