Table 2 Characteristics of the nodules and FNA cytology according to the Bethesda system
Variable | Mean (SD) | N | % | |
|---|---|---|---|---|
Nodule number | ||||
Single | 251 | 45.6 | ||
Multiple | 299 | 54.4 | ||
Nodule size (cm) | 3.4 (1.4) | |||
< 1 cm | 1 | 0.2 | ||
1.0–2.0 | 90 | 16.4 | ||
2.1–4.0 | 326 | 59.3 | ||
> 4.0 | 133 | 24.2 | ||
Radiology | ||||
1 | Benign | 1 | 0.2 | |
2 | Very low suspicion | 55 | 10.0 | |
3 | Low suspicion | 306 | 55.6 | |
4 | Intermediate suspicion | 138 | 25.1 | |
5 | High suspicion | 50 | 9.1 | |
FNA ordered | ||||
Yes | 543 | 98.7 | ||
No | 7 | 1.3 | ||
FNA result | ||||
Bethesda I | Nondiagnostic | 18 | 3.3 | |
Bethesda II | Benign | 320 | 58.9 | |
Bethesda III | AUS/FLUS | 77 | 14.2 | |
Bethesda IV | FN/SFN | 81 | 14.9 | |
Bethesda V | Suspicious of malignancy | 21 | 3.9 | |
Bethesda VI | Malignant | 26 | 4.8 | |