Table 1. US Patterns of Malignant Tumors.

US Pattern (K-TIRADS)	No. of Malignant Tumors (%)	No. of Papillary Carcinoma (%)	No. of Follicular Carcinoma (%)	No. of Other Malignant Tumors (%)
All	454	388	48	18
High suspicion (K-TRIADS 5)	233 (51.3)	221 (57.0)	5 (10.4)	7 (38.9)
Intermediate suspicion (K-TIRADS 4)	133 (29.3)	101 (26.0)	22 (45.8)	10 (55.6)
Low suspicion (K-TIRADS 3)	88 (19.4)	66 (17.0)	21 (43.8)	1 (5.6)

Numbers in parentheses are percentages and indicate proportion of US patterns in each malignant tumor. K-TIRADS = Korean-Thyroid Imaging Reporting and Data System, US = ultrasonography