Table 4.

The prevalence of malignancy in each C-TIRADS classification.

Classification	No. of malignant nodules	Total no. of nodules	Prevalence of malignancy (%)	Suggested malignancy risk (%)
C-TIRADS 2	0	370	0%	0%
C-TIRADS 3	31	2,271	1.37%	<2%
C-TIRADS 4A	301	2,834	10.62%	2–10%
C-TIRADS 4B	854	2,134	40.02%	10–50%
C-TIRADS 4C	2,763	3,544	77.96%	50–90%
C-TIRADS 5	334	353	94.62%	>90%

C-TIRADS, Chinese thyroid imaging reports and data systems.