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Columnar cell variant of papillary thyroid carcinoma (PTC). (A) Papillary and glandular architecture lined by columnar cells showing nuclear stratification and lacking characteristic nuclear features of PTC (H&E stain, ×400). (B) Columnar cells resemble secretory-type endometrium having supranuclear cytoplasmic vacuoles (H&E stain, ×400).
