Pregnancy following treated malignant struma ovarii.

Struma ovarii [SO] is a rare, highly specialised form of mature ovarian teratoma, consisting predominantly of thyroid tissue. Malignant transformation occurs in about 5% of SO [1]. Diagnosis of malignant SO is usually made histologically. The majority of malignant SO show a follicular or papillary pattern of thyroid carcinoma. Conservative ovarian surgery is preferred when there is a concern about fertility [2–4]. About 24 cases of malignant SO have been reported until 2003 [5]. Of these only a small number were associated with pregnancy [6–8], in whom diagnosis of malignant SO was made during the pregnancy. Though pregnancy is possible after treatment of malignant SO, no reports are available. We document a rare case of a woman who had two successful pregnancies after treatment of a malignant SO.