Background: The improved detection of TNs (TNs) with US has resulted in an increase in the number of thyroid fine needle aspiration biopsy (FNAB). Appropriate criteria are necessary to avoid an increase of rather unnecessary benign cytologic results in TNs. Thyroid imaging reporting and data system (TIRADS) was first used by Horvath et al in 2009. This was to standardize the reporting of results of thyroid (ultrasonography) US that can be understood by clinicians and also stratify the risk of malignancy of a lesion based on the US features of the lesion.Methods: Cases with uninodular or multinodular goiter had been included. Evaluation of cases had been done using ultrasound of the neck. TNs were classified into categories according to thyroid imaging reporting and data system of the American colleague of radiologists (ACR-TIRADS).Cases were ordered for fine needle aspiration cytology (FNAC). Operable cases were only included in the study and postoperative histopathology was revised.Results: The study included 46 patients. The different TIRADS categories were confronted with the results of cytology and histopathology. Combining TIRADS 2 and 3 as probably benign categories and TIRADS 4 and 5 as probably malignant categories, the sensitivity, specificity, positive predictive value (PPV) and negative predictive value (NPV) were respectively 100%, 84.38%, 73.68% and 100%. The accuracy of ACR-TIRADS was 89.13%.Conclusions: ACR-TIRADS helps in stratifying nodular thyroid disease based on the risk of malignancy. It could lead to a significant decrease of the number of unnecessary FNABs.
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