Teratoma with Endocrine Differentiation

**Semantic type:** Neoplastic Process

**Definition:** A teratoma that arises outside an endocrine organ and shows endocrine differentiation. The endocrine component ranges from benign endocrine tissue to malignant endocrine neoplasms. This category includes struma ovarii, thyroid carcinoma arising in struma ovarii, and carcinoid tumor arising in ovarian teratoma.