Malignancy Risk and Related Factors of Atypia of Undetermined Significance/Follicular Lesion of Undetermined Significance in Thyroid Fine Needle Aspiration

Table 1

Basal characteristics among groups with repeated FNA, thyroidectomy, and follow-up loss after initially being diagnosed as AUS/FLUS.

	Number of nodules	Age (yrs)	Number of women (%)	TSH (uIU/mL)	Free T4 (ng/dL)	Size (mm)	K-TIRADS
Repeated FNA	248	52 ± 11	216 (87.1)	2.47 ± 2.99	1.22 ± 0.22	11.8 ± 7.8	3.53 ± 0.62
Thyroidectomy	49	51 ± 11	43 (87.8)	2.20 ± 1.67	1.31 ± 0.34	18.7 ± 16.8	3.71 ± 0.76
Follow-up loss	390	53 ± 12	344 (88.2)	2.43 ± 4.26	1.26 ± 0.51	—	—
value		0.54	0.92	0.90	0.49	<0.01	0.12

FNA: fine needle aspiration; AUS/FLUS: atypia of undetermined significance/follicular lesion of undetermined significance; K-TIRADS: Korean Thyroid Imaging Reporting and Data System.