Fig. 4

Different types of ZTTN. (A) shows the ZTTN grade 0 (unrecognizable) in the short-axis section of thyroid. (B) shows that solid ZTTN (white arrow) in the short-axis section with the distance from the farthest outside of ZTTNs (white arrow) to the outer edge of the thyroid not exceeding 5.0 mm (ZTTN grade 1). (C) shows that the location of cystic-solid ZTTN (white arrow) in the short-axis section with the distance from the farthest outside of the ZTTNs (white arrow) to the outer edge of thyroid being 7.0 mm (ZTTN grade 2). (D) shows that the location of solid ZTTN (white arrow) in long-axis section with the distance from the farthest outside of the ZTTNs (white arrow) to the outer edge of thyroid exceeding 10.0 mm (ZTTN grade 3)