A 75-year-old patient with a long-standing multinodular goiter presents with a rapidly enlarging, painful neck mass and dyspnea. Histology shows highly pleomorphic spindle cells. What is the diagnosis?
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Correct answer: Anaplastic carcinoma
Anaplastic thyroid carcinoma is a highly aggressive, undifferentiated tumor that typically occurs in the elderly. It often presents as a rapidly growing mass that invades local structures, carrying a very poor prognosis.
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