To the Editor.-We have read the Letter to the Editor by Warrick and Lengerich 1 on ''Thyroid cancer overdiagnosis and malpractice climate'' with interest, that, in our opinion, explained the key difference in thyroid pathology practice between North America and the rest of the world. Significant interobserver variations in benign and malignant thyroid diagnosis have been noted among American and Japanese pathologists since 2002. 2 Notably, Asian pathologists favored a benign diagnosis for gray-zone cases. 2 Even with active participation in international working groups to establish a consensus and use of standardized diagnostic criteria for thyroid tumor diagnosis, the practice has not changed much according to the content of this letter. 1 So-called defensive medicine practiced in North America is not common among pathologists practicing in other countries. When one of us was invited to provide an expert opinion on a lawsuit for a false-positive diagnosis on thyroid fine-needle aspiration (FNA) cytology in Japan, a database of judicial precedents was searched for similar cases. However, there were no previous cases involving thyroid FNA cytology. 3 We conducted a survey among 19 pathologists in 11 countries (