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

Table 2

Basal characteristics of repeated FNA after initially being diagnosed as AUS/FLUS according to the second FNA results.

	Number of nodules	Age (yrs)	% of women	TSH (uIU/mL)	Free T4 (ng/dL)	Size (mm)	K-TIRADS
Repeated FNA
II. Benign	123	52 ± 12	89.1	2.19 ± 1.74	1.23 ± 0.19	13.0 ± 8.5§	3.4 ± 0.5§
III. AUS/FLUS	49	52 ± 11	78.4	3.02 ± 5.56	1.20 ± 0.24	12.2 ± 7.4¶	3.5 ± 0.6¶
IV. FN	47	51 ± 10	89.8	2.62 ± 2.26	1.21 ± 0.25	7.9 ± 4.4§¶	4.2 ± 0.6§¶
V. Susp. malig
VI. Malig
value		0.69	0.93	0.32	0.74	<0.01	<0.01

Data are the mean ± standard deviation. §: value < 0.05 for II. Benign versus IV. FN, V. Susp. malig, and VI. Malig; ¶: value < 0.05 for III. AUS/FLUS versus IV. FN, V. Susp. malig, and VI. Malig; FNA: fine needle aspiration; AUS/FLUS: atypia of undetermined significance/follicular lesion of undetermined significance; K-TIRADS: Korean Thyroid Imaging Reporting and Data System; FN: follicular neoplasm; Susp. malig: suspicious for malignancy; Malig: malignant.