Objective:

To study the role of Thyroid Imaging Reporting and Data System (TI-RADS) category in ultrasonic diagnosis of thyroid cancer.

Methods:

A total of 75 patients with thyroid diseases who underwent surgery or fine needle aspiration (FNA) were selected. All the patients underwent thyroid examination with high-frequency color Doppler ultrasonography. According to TI-RADS category

63 patients (81 thyroid lesions) with TI-RADS grade 3-5 were r

ecruited. The characteristics of highfrequency color Doppler ultrasonography in diagnosis of thyroid lesions with different TI-RADS grades were compared with the histopathological results. Then the efficacy of TI-RADS category in the identification of thyroid cancer was assessed.

Results:

In all 63 patients (81 thyroid lesions) confirmed by histopathology

28 lesions were TI-RADS grade 3

in which 23 (82.14％) were benign

5 (17.86%) were malignant; 32 lesions were TI-RADS grade 4

and histopathology confirmed 5 (15.63％) were benign

27 (84.37％) were malignant; 21 lesions were TI-RADS grade 5

and all the lesions were malignant confirmed by histopathology (100％). The sensitivity and specificity were 88.67％ and 82.14％ respectively in the diagnosis of thyroid cancer by TI-RADS category. Statistical differences were found among thyroid lesions with TI-RADS grades 3

4

5 in A/T

margin

boundary

calcification

vascularity and blood flow and resistance index (RI).

Conclusion:

The sensitivity and specificity of TI-RADS category are high in diagnosing thyroid cancer by high-frequency color Doppler ultrasound.