Table 5. Malignancy rate according to TI-RADS of 313 thyroid nodules surgically resected at a single center.

TI-RADS categories	No. of cases (n)	Pathological results (n)		Malignancy ratea (%)	Malignancy rateb (%)
		Benign	Malignant
3	67	65	2	3.0	2.0-2.8
4a	31	24	7	22.6	3.6-12.7
4b	27	16	11	40.7	6.8-37.8
4c	158	14	144	91.1	21.0-91.9
5	30	0	30	100	88.7-97.9
Total	313	119	194

^a The rate of malignancy in this study; ^b The rate of malignancy in Kwak et al's study.