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Examples of thyroid nodules (TNs) that could not be classified according to American Thyroid Association (ATA) Guidelines. (A1) (transversal)/(A2) (sagittal): Solid isoechoic papillary thyroid carcinoma (PTC) with irregular margins (A2, white triangle markers). (B1) (transversal)/(B2) (sagittal): Mainly solid isoechoic benign (Bethesda II) thyroid nodule (TN) with taller-than-wide (TTW) shape.
