Ovarian Monodermal and Highly Specialized Teratoma

**Semantic type:** Neoplastic Process

**Definition:** A teratoma of the ovary composed exclusively or predominantly of a single type of tissue derived from the ectoderm or endoderm. A representative example is struma ovarii which is a teratoma composed exclusively or predominantly of thyroid tissue.

**Synonyms:** - Ovarian Germ Cell Monodermal and Highly Specialized Teratoma