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Tumors of the thyroid gland: histologic and cytologic features--part 1.

Every year, 18,000 new thyroid cancer cases are reported in the United States, representing 1.2% of the total number of new cancer cases of all sites. Thyroid cancer accounts for 1,200 deaths, or 0.2% of the total number of deaths related to cancer. 1 Over the last two decades, there has been important progress in our understanding of tumors of the thyroid gland, from both histopathologic and etiopathogenetic points of view. In the first part of this review, we summarize the histologic and cytologic features of benign and malignant tumors of the thyroid gland that derive from follicular cells.