Table 2.
US features of 16 thyroid nodules with benign histology that showed a gradual size decrease on follow-up US
| US characteristic | Initial US feature | Follow-up US featurea) |
|---|---|---|
| Internal content | ||
| Solid | 8 (50) | 16 (100) |
| Predominantly solid | 4 (25) | - |
| Predominantly cystic | 4 (25) | - |
| Shape | ||
| Ovoid-to-round | 16 (100) | 12 (75) |
| Irregular | - | 4 (25) |
| Margin | ||
| Smooth | 9 (56) | 1 (6) |
| Ill-defined | 6 (38) | 13 (81) |
| Spiculated | 1 (6) | 2 (13) |
| Echogenicity | ||
| Markedly hypoechoic | 3 (19) | 6 (38) |
| Hypoechoic | 8 (50) | 10 (62) |
| Isoechoic | 5 (31) | - |
| Calcification | ||
| Microcalcification | 1 (6) | 2 (13) |
| Macrocalcification | 2 (13) | 3 (19) |
| Rim calcification | 1 (6) | 1 (6) |
| Inner isoechoic rim | 0 | 15 (94) |
| Low-echoic halo | 5 (31) | 13 (87) |
Values are presented as number (%).
a)
Ultrasonographic (US) features at the time of core needle biopsy. The numbers in parentheses are percentages.