Fig. 1From: Analysis of 665 thyroid nodules using both EU-TIRADS and ACR TI-RADS classification systemsDifferences between ACR TI-RADS and EU-TIRADS classification systems. In ACR TI-RADS, the risk category is based on a sum of points assigned to 5 sonographic features. In EU-TIRADS a specific feature instantly classifies the nodule into one category. Adapted from references 3 and 6. Adapted from references 3 and 6Back to article page