Table 2.

TIRADS classification

Tirads	Definition	Ultrasound features
1	Negative	Normal thyroid
2	Benign	Benign features
3	Probably benign	Without suspicious features
4 A	Low suspicion	One suspicion feature
4 B	Intermediate suspicion	Two suspicion feature
4C	Moderate suspicion	Three or four suspicion feature
5	High suspicion	Five suspicion feature
6	Known proved malignancy	Confirmed malignancy