Hurthle cells (oncocytes) are commonly seen in which of the following conditions?
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Correct answer: Hashimoto thyroiditis
Hurthle cells are thyroid follicular cells that have undergone metaplasia, characterized by abundant, granular, eosinophilic cytoplasm due to high mitochondrial content. They are a classic feature of Hashimoto thyroiditis and follicular Hurthle cell neoplasms.
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