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Objective
Ultrasound (US) is the pivotal procedure during the diagnostic work‐up of thyroid nodule and several US‐based risk stratification systems (RSSs) have been recently developed. Since the performance of RSSs in detecting medullary thyroid carcinoma (MTC) has been rarely investigated, the present systematic review aimed to achieve high evidence about (1) how MTC is classified according to RSSs;...