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Upper panel: Oncocytic noninvasive encapsulated follicular variant of papillary thyroid carcinoma (O-NI-EFVPTC) is completely encapsulated (black arrows) without evidence of capsular or vascular invasion. Lower panel: The lesional cells show oncocytic features with abundant eosinophilic cytoplasm and nuclear features of papillary thyroid carcinoma with chromatin clearing and frequent nuclear grooves (blue arrows). Scale bars: 200 microns in upper panel, and 30 microns in lower panel.
