Abstract: Ovarian mature cystic teratoma complicated with thyroid carcinoid is a rare ovarian malignant tumor. Thyroid carcinoid is derived from endodermal sinus tumor in germ cell tumor, and its incidence rate is very low, accounting for only about 0.1% of ovarian malignancies thyroid carcinoid is a low grade neuroendocrine tumor with low malignancy and good prognosis. Metastatic cancer should be excluded first in the diagnosis, and then differentiated from ovarian granulosa cell tumor, supporting cell tumor, malignant ovarian goiter and so on. The main treatment is surgery, but because of the disease is rare, the standard of treatment plan has not yet been established. In recent years, there have been new advances in clinical features, pathology, immunohistochemistry, and treatment for primary ovarian mature cystic teratoma complicated with thyroid carcinoid. This article reports a case and discusses the research progress of the disease, providing a reference for follow-up treatment.

Key words: Struma ovarii, Ovarian neoplasms, Teratoma, Carcinoid tumor, Case reports