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Primary thyroid tumors with extensive clear cell changes are extremely rare. More than 10,000 ultrasound‐guided thyroid fine needle aspirations examined over a period of 17 years by the first author, only one of the 530 (<0.2%) papillary thyroid carcinomas (PTCs) and three of the 42 (7.1%) follicular thyroid carcinomas (FTCs) had extensive cytoplasmic clearing. Thyroidectomies were performed for...
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