Malignant struma ovarii with Graves' disease

Background. Malignant struma ovarii is a rare tumor, consisting of a struma ovarii with malignant change. Because of the rarity of the tumor, only a f ew reports with detailed data of thyroid function of the patient have been published. Case. Medical and surgical treatments were performed in a case of malignant struma ovarii with Graves' disease and data from thyroid function tests we re analyzed. After removal of the tumor, rapid improvement of thyroid funct ion was observed and thyroglobulin level decreased. Conclusion. This case demonstrates the possible, if not dominant, contribut ion from the malignant struma ovarii to the hyperthyroidism of the patient. (C) 2000 Academic Press.