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A 14-mm thyroid mass in the right thyroid gland shows two suspicious US features: complete solid and taller-than-wide shape on US (A, transverse image; B, longitudinal image). Thyroid Imaging Reporting and Data System category 4b and a total risk score of 1 were assigned. This thyroid nodule was diagnosed as malignant on cytological examination and proved to be papillary thyroid cancer on surgery.
