Table 2.
Comparison of the rate of malignancy determined by postoperative histopathological examination in HC and non-HC nodules in relation to the category of FNA result*,**
| Category of FNA results | Results of histopathological examinations—No/% of patients | p | |||
|---|---|---|---|---|---|
| HC smears | Non-HC smears | ||||
| Benign | Malignant | Benign | Malignant | ||
| Last FNA before Bethesda classification—2005–2009 | |||||
| II | 89/95.6 | 4/4.3 | 875/99.4 | 5/0.6 | 0.0026 |
| III | 4/100.0 | – | 19/100.0 | – | – |
| IV | 53/91.4 | 5/8.6 | 67/90.5 | 7/9.5 | 0.8679 |
| V | 6/85.7 | 1/14.3 | 33/84.6 | 6/15.4 | 0.6193 |
| VI | – | 3/100 | 3/5.4 | 53/94.6 | 0.3486 |
| Total | 152/92.1 | 13/7.9 | 997/93.4 | 71/6.6 | 0.5592 |
| Last FNA after Bethesda classification—2010–2017 | |||||
| II | 54/98.2 | 1/1.8 | 1184/99.2 | 9/0.8 | 0.9269 |
| III | 28/90.3 | 3/9.7 | 204/96.2 | 8/3.8 | 0.3104 |
| IV | 69/87.3 | 10/12.7 | 57/89.1 | 7/10.9 | 0.7519 |
| V | 7/58.3 | 5/41.7 | 28/41.8 | 39/58.2 | 0.2881 |
| VI | – | 8/100 | 4/3.1 | 124/96.9 | 0.5680 |
| Total | 158/85.4 | 27/14.6 | 1477/88.8 | 187/11.2 | 0.1758 |
*When several FNA were performed in a patient, the outcome of the last one was considered
**Statistical analysis did not include incidental cancers