Table 3. Malignancy rates according to mTI-RADS category in patients coexistent with Hashimoto’s thyroiditis.

mTI-RADS category	Risk score (RS)	No. of thyroid malignancy	No. of total nodules	Malignancy rate (%)
3 (very low risk)	0 ≤ RS < 1.5	2	54	3.7
4a (low risk)	1.5 ≤ RS < 3	36	187	19.3
4b (moderate risk)	3 ≤ RS < 4.5	37	97	38.1
4c (high risk)	4.5 ≤ RS < 6	47	75	62.7
5 (very high risk)	6 ≤ RS	16	17	94.1

Note – mTI-RADS, modified thyroid imaging reporting and data system.