Fig. 1. Ultrasonographic findings of thyroid gland of Case 1 (2011-2013). Enlargement of right thyroid lobe with heterogeneous echogenicity at sonogram obtained in 2011 (A) and 2012 (B). In 2013, markedly enlarged right (C) and left (D) lobes of thyroid gland is observed with progressive changes of heterogeneous echogenicity.
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