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anaplastic thyroid cancer definition: (an-a-PLAS-tik) A rare, aggressive type of thyroid cancer in which the malignant (cancer) cells look very different from normal thyroid cells.
Thyroid Gland Undifferentiated (Anaplastic) Carcinoma definition: A primary carcinoma of the thyroid gland composed of undifferentiated cells. The malignant cells demonstrate evidence of epithelial differentiation, either by immunohistochemistry or electron microscopic studies. Microscopically, in the majority of cases there is a mixture of spindle, epithelioid, and giant cells. The vast majority of the patients present with a rapidly enlarging neck mass. The clinical course is usually aggressive.
 
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