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A 56-year-old woman with a thyroid nodule in the right thyroid on US. Initial FNAB revealed the nodule to be benign on cytology, and follow-up FNAB after 3 year showed the same cytologic result. (A) Initial US shows a mixed echoic nodule (< 50% cystic) (arrows). (B) On follow-up US, this nodule showed increased size without change in shape (arrows). US, ultrasound; FNAB, fine needle aspiration biopsy.
