Thyroid cancer refers to any of four kinds of
tumors of the
thyroid gland: papillary, follicular, medullary and anaplastic. Papillary and follicular tumors are the most common and usually are
benign: they grow slowly, may recur, but are generally not fatal in patients under 45 years of age. Medullary and anaplastic tumors are
malignant.
Medullary tumors have a good prognosis if restricted to the thyroid gland and a poorer prognosis if
metastasis occurs. Anaplastic tumors are fast-growing and respond poorly to therapy.
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