Table 2. ACR TIRADS categories of cytological indeterminate thyroid nodules.

ACR TIRADS categories	Points	Malignant (n = 12)	Benign (n = 29)	Risk of malignancy (%)	K-RAS mutation in FNA sample (%)	K-RAS mutation in surgical specimen (%)
TR2	2	0 (0.0)	4 (13.8)	0	0	0
TR3	3	2 (16.7)	3 (10.3)	40	40	60
TR4	4	1 (8.3)	8 (27.6)	6.7	20	33.3
	5	0 (0.0)	2 (6.9)
	6	0 (0.0)	4 (13.8)
TR5	7	4 (33.3)	5 (17.2)	52.9	11.8	11.8
	8	2 (16.7)	1 (3.4)
	9	2 (16.7)	1 (3.4)
	10	1 (8.3)	1 (3.4)

Number in parentheses is percentages.