with the current use of high-resolution US techniques (Popoveniuc et al., 2012). Nodules can be benign or malignant. Some studies have shown that less than 10% of thyroid nodules are malignant (Boniface et al., 2013). Fine-needle aspiration (FNA) biopsy plays a major role in the differential diagnosis, but its execution needs to be selective, due to associated cost, potential non-diagnostic results and the risk of overdiagnosis (Grani et al., 2018). A number of classification systems have been
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