Neoplastic Process
struma ovarii
Subclass of:
Teratoma
Definitions related to struma ovarii:
  • A rare teratoid tumor of the ovary composed almost entirely of thyroid tissue, with large follicles containing abundant colloid. Occasionally there are symptoms of hyperthyroidism. 5-10% of struma ovarii become malignant, the only absolute criterion for which is the presence of metastasis. (Dorland, 27th ed; Segen, Dictionary of Modern Medicine, 1992)
    NLM Medical Subject Headings
    U.S. National Library of Medicine, 2025
  • An ovarian mature teratoma characterized by the presence of aberrant thyroid tissue.
    NCI
    U.S. National Cancer Institute, 2021
  • Struma ovarii is a rare ovarian tumor defined by the presence of thyroid tissue comprising more than 50% of the overall mass. It most commonly occurs as part of a teratoma, but may occasionally be encountered with serous or mucinous cystadenomas.
    Medscape
    WebMD, 2025
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