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A, B. Longitudinal (A) and transverse (B) US show a hypoechoic solid thyroid nodule (size: 43 mm × 24 mm × 29 mm) with wider-than-tall shape and extra-thyroidal extension. Macrocalcification and punctuate echogenic foci are observed. The nodule was classified as ACR TIRADS category TR5. The cytological diagnosis was follicular neoplasm with positive K-RAS mutation.
