Comparison Of American College Of Radiology And Kwak Thyroid Imaging Reporting And Data System

Purpose: To compare the diagnostic value of Thyroid Imaging Reporting and Data System(TI-RADS)made out by American College of Radiology(ACR TI-RADS)and Kwak(Kwak TI-RADS)on thyroid noudles.Materials and Methods: Clinical data and preoperative ultrasound images of 920 patients with thyroid noudles(in total 1130 nodules)were retrospectively analyzed.The nodules were classified according to two TI-RADS standards and performance curves of the subjects were constructed with surgical pathological results as golden standards.Diagnostic value of two TI-RADS on thyroid noudles was analyzed and diagnostic efficiency was compared.Results: For the 1130 thyroid nodules,malignant rate for 1~5 category patients classified by ACR TI-RADS was 0,0,8.4%,50.9% and 88.4% respectively;and that for 2-5 category patients(2,3,4a,4b,4c,5)classified by Kwak TI-RADS was 0,1.2%,9.1%,50.0%,87.8% and 89.5% respectively.Susceptibility,specifcity,positive predictive value(PPV),negative predictive value(NPV),accuracy and area under curve(AUC)of benign and malignant thyroid nodules diagnosed by Kwak TI-RADS were 95.7%,77.9%,75.5%,96.3%,85.3% and 0.925,respectively.Susceptibility,specifcity,PPV,NPV,accuracy and AUC of benign and malignant thyroid nodules diagnosed by ACR TI-RADS were 97.0%,73.2%,72.0%,97.2%,83.1% and 0.918,respectively.A statistical difference in specifcity was shown between ACR TI-RADS and Kwak TI-RADS(P<0.05),but no statistical difference in susceptibility,PPV,NPV,accuracy or AUC was found between the two groups(P>0.05).Conclusion: The two TI-RADS were of quite high value in diagnosing benign and malignant thyroid nodules.Kwak TI-RADS was of higher specificity compared with ACR TI-RADS.