Abstract
Struma ovarii is an ovarian teratoma mainly composed of thyroid tissue, which can become malignant with possible peritoneal dissemination or even distant metastases. Therapeutic management follows protocols used for thyroid cancer. We report the first use of (18)F-fluorodeoxyglucose positron emission tomography (PET) in the follow-up of malignant struma ovarii with persistently elevated serum thyroglobulin level and negative diagnostic iodine 131 whole body scan after thyroidectomy and four courses of 131 iodine. Hilar and mediastinal lymph node uptake was detected but histological verification concluded that there was a false-positive localization corresponding to sarcoidosis lesions without malignant aspect.
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