This is a particularly virulent form of thyroid carcinoma. It occurs in the elderly and has a variable pathology, including spindle, squamous, and anaplastic cells.
本病为最恶性的甲状腺癌，见于老年人，病理各异，包括纺锤状、鳞状和未分化细胞。
Anaplastic thyroid carcinoma is a very rare but aggressive form of the disease, affecting less than 5% of those diagnosed with thyroid cancer.
未分化甲状腺癌非常罕见但是病程进展较快，占诊断明确甲状腺癌患者的5％。
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