Thyroid malignancy comprises only 1% of all malignancies of the human being, and 5. 1% of all thyroid malignancies occurs in children.
Generally, its natural history varies from a slowly growing to a rapidly growing tumor, so, 20 to 30: year follow up studies are necessary. Transformations of a low-grade to a high-grade malignancy is well known in thyroid cancer. In Korea, thyroid cancer of children is very rare. We report a 9-year-old boy with a thyroid tumor which proved follicular adenocarcinoma, histopathologically.
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