Figure 2.

Group B. Suspicious for follicular (Hurthle cell) neoplasm seen on ultrasonography. A 43-year-old female had a 1.1-cm-sized round isoechoic nodule (arrow) with a peripheral halo in the right thyroid gland on ultrasonography, which was inconclusive at ultrasonography-guided fine-needle aspiration cytology. Ultrasonography-guided core needle biopsy was still not conclusive in that nodular hyperplasia and Hurthle cell neoplasm were considered in the differential diagnosis. Surgery confirmed nodular hyperplasia.