Abstract: Objective:To discuss the clinical characteristics, diagnosis, treatment experience and prognosis of mature cystic teratoma complicated with primary ovarian carcinoid,and to summarize its general charateriseics and to enhance the knowledge of clinician. Methods: Three female patients presented unilateral ovarian tumor in physical examination and were admitted to hospital.The tumor markers of three patients were normal. The preoperative diagnosis was ovarian tumor.Unilateral salpingo-oophorectomy was conducted in two patients.The resection of ovarian tumor was conducted in one patient. Results: The three patients underwent operation successfully.The postoperative pathological diagnosis was mature cystic teratoma complicated with primary ovarian carcinoid.The patients recovered well, who accepted 15-month follow-up with normal life and stable condition,and had no recurrence and metastasis. Conclusion: Mature cystic teratoma complicated with primary ovarian carcinoid is easy to be misdiagnosed before operation.Salpingo-oophorectomy is commonly used as the treatment method of mature cystic teratoma complicated with primary ovarian carcinoid and it can result in good effectiveness and better prognosis.

Key words: mature cystic teratoma, strumal variant, primary ovarian carcinoid, carcinoid syndrome