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This website sought to develop and validate model for predicting the risk of Metastasis of Lymph Node Posterior to the Recurrent Laryngeal Nerve (LN.prRLNM) in clinically node-negative PTC's using machine learning algorithms.Only input the patient's preoperative and intraoperative clinicopathological characteristics as the following to predict the likelihood of Metastasis of LN.prRLN.