Thyroid fine-needle aspiration cytology (FNAC) is one of the most performed medical procedures worldwide. ¹ It is used as a diagnostic test to separate benign thyroid nodules (colloidal and hyperplastic nodules) from thyroid malignancies, either primary (papillary thyroid carcinoma (PTC), medullary thyroid carcinoma (MTC), poorly differentiated thyroid carcinoma (PDTC), anaplastic thyroid carcinoma (ATC)) or less often metastatic. ² The negative and positive predictive values (NPV and PPV) of this procedure in The Bethesda System for Reporting Thyroid Cytopathology (TBSRTC) are respectively 97% and 98% for the benign and malignant categories. This article is protected by copyright. All rights reserved.