A struma ovarii (literally: goitre of the ovary) is a rare form of monodermal teratoma that contains mostly thyroid tissue, which may cause hyperthyroidism. Despite its name, struma ovarii is not restricted to the ovary. The vast majority of struma ovarii are benign tumors; however, malignant tumors of this type is found in a small percentage of c...
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http://en.wikipedia.org/wiki/Struma_ovarii
A rare teratoid tumour 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. ... (12 Dec 1998) ...
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http://www.encyclo.co.uk/local/20973
Type: Term Definitions: 1. a rare ovarian tumor, regarded as teratomatous, in which thyroid tissue has surpassed the other elements; occasionally associated with hyperthyroidism.
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http://www.medilexicon.com/medicaldictionary.php?t=85696
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