We read with great interest the article published by Son et al. entitled "Distribution and malignancy risk of six categories of the pathology reporting system for thyroid core-needle biopsy in 1,216 consecutive thyroid nodules" [1]. In this article, the authors evaluated the distribution of thyroid nodules among the six categories of the pathology reporting system for thyroid core-needle biopsy (CNB), along with the range of malignancy risk of each category based on different diagnostic criteria for benignity in a large-population clinical cohort. They suggested that first-line CNB tended to yield a higher rate of conclusive results than second-line CNB with prior inconclusive fine-needle aspiration (FNA) results. The authors achieved excellent CNB results with a low complication rate. Thus, the data presented in this article furnish important support for the recommendations of the CNB guidelines developed by the Korean Society of Thyroid Radiology [2]. Moreover, this study provides useful results that may help patients with thyroid nodules to avoid repetitive FNA or diagnostic surgery involving CNB [3,4]. In particular, the results are valuable in that they provide the range of malignancy risk of each category based on different diagnostic criteria for benignity. It is very interesting that the final diagnosis of a benign nodule was made by three criteria [1]. We agree with the authors' opinion and personally prefer criterion 1.