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WHO Classification of Tumours
Struma ovarii, malignant
Ovary


Definition

A mature ovarian teratoma characterized by the presence of aberrant thyroid tissue with morphologic changes identical to thyroid carcinoma, i.e. the criteria used for malignant changes within struma ovarii are the same as those used for a diagnosis of malignancy in the thyroid gland
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Tavassoli FA, Devilee P (Eds.)
World Health Organization Classification of Tumours. Pathology and Genetics of Tumours of the Breast and Female Genital Organs.
3rd Edition
IARC Press: Lyon 2003



. Patients may present with abdominal mass and unusual symptoms due to thyrotoxicosis, or with Meigs syndrome (ascites and pleural effusion).