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Table 3 Distribution of benign and malignant thyroid nodules (≤ 10 mm) according to the three ultrasound classification systems

From: Malignancy risk stratification of thyroid nodules smaller than 10 mm with ACR-TIRADS, K-TIRADS, and ATA-2015 guidelines: a prospective study

Risk category

Benign nodules (n, [%])

Malignant nodules (n, [%])

Prevalence of Malignancy (%)

ACR-TIRADS*

TR2

24 (9.6)

0 (0.0)

0.0

TR3

153 (61.2)

7 (18.9)

4.4

TR4

61 (24.4)

13 (35.1)

17.6

TR5

12 (4.8)

17 (45.9)

58.6

ATA-2015**

Very low suspicion

28 (11.2)

1 (2.7)

3.4

Low suspicion

187 (74.8)

14 (37.8)

7.0

Intermediate suspicion

25 (10.0)

7 (18.9)

21.9

High suspicion

10 (4.0)

15 (40.5)

60.0

K-TIRADS***

2

28 (11.2)

1 (2.7)

3.4

3

187 (74.8)

14 (37.8)

7.0

4

27 (10.8)

7 (18.9)

20.6

5

8 (3.2)

15 (40.5)

65.2

  1. *American College of Radiology—Thyroid imaging reporting and data system
  2. **American Thyroid Association
  3. ***Korean thyroid imaging reporting and data system